EDIT….Is my son okay? (Trigger warning)

Question

So I have noticed unusual changes in my almost 7 year old son recently and it’s killing me inside. I can’t believe I’m actually going to write this, but I need advice badly. 
Some background: 
My son is part of a blended family. I have been with my partner for almost 3 years. We dated for 1 year before he met my son and we moved in together after 2 years. 
He works night shift all the time so he’s barely ever home. 
My sons dad was in a relationship with his girlfriend (who has 2 girls 5 and 8) for 9 months. He moved them into his house after 4-5 months. 
I love that he now has siblings to play with and I was so happy to hear they are getting along. My son stays with his father through half the summer holidays. When he came home though he was acting different. 
He will not take his clothes off in sight of anyone. Usually he would come in and say mum can you help me with my t-shirt etc. Now he will go crazy if you so much as look at him. At first I just thought it was a new thing he was going through and I respected his privacy but he has also been putting his chair behind his door at night. I noticed because I go tuck him in again before I go to bed and I can never get in his room. Again I though oh it’s a mistake but he does it every night and he will no longer sleep without a night light because he gets nightmares. 
This all started after he came home from staying with his dad and his girlfriend and her girls. 
I was abused when I was a child and honestly don’t trust ANYONE! I need someone to tell me I’m thinking the worst because I’ve been through the worst and this is normal behaviour. 
Or there may actually be something wrong here? 
I’m planning to have another safe/unsafe talk with him about his body and explain to him he can always talk to me if there is something happening. 
I just don’t know what to think before I go apeshit and murder every other person near him who isn’t his mummy. 
Obviously I know I can’t do much until I speak to him but he’s asleep now and I can’t sleep from worry.
EDIT:
so I spoke to him and he said that his dad says he needs to always cover up and get dressed in his room. I spoke to his dad and he confirmed this as there are 2 young girls living there! I completely understand and I’m glad I got an explanation for this one. 
As for the chair in front of the door, I’m happy to say that it wasn’t what I thought! So one of his friends, big brother has an IT figurine. (Yes the scary ass clown that eats children) and he brought it into school and showed his group of 6 year old friends. (The figure was IT with its mouth wide open and George’s arm sticking out of it as George was laying in a pool of blood on the floor. With a missing arm) so he told me all about it and said he was scared and that’s why the light is always on and he stays under the covers. 
So I contacted his best friends mum and said 
“hey how’s ….. has he been acting strange recently? Lights always on at night, putting chairs behind his door etc?” 
She replies, “how did you know that? He’s been very weird! Stopped playing mine craft too because the ‘scary guy is in it” 
So I tell her what my son says and she goes and speaks to her son and he gives the exact same story. 
Also IT is in a special mine raft world and that’s why he said he wasn’t playing it anymore!!!! 
He is definitely traumatised but I can honestly say I’ve never been so relieved! 
I contacted the school to make sure said child doesn’t bring in any scary child eating clown figures again.

I also want to thank all of you for the advice and being so amazing! I really appreciate it and I know I can project my own experience into life but I’m working on that. 
Thank you ladies ❤️❤️❤️❤️❤️

Answer

Nothing he’s doing is normal. Follow your guy. For sure sit and talk to him, but make sure to get authorities involved as well. Even if it ends up nothing , mom should be protecting and doing everything possible. Good for you for seeing the signs and questioning.

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Not normal. I would seek professional advice from psychologist if you have one. If not, I would consider looking for one. Sudden changes should always be consider as red flags, in my opinion. Better safe than sorry.

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That's not normal. I give you permission to go apeshit. Thankfully, I have never personally been abused in anyway but once I started reading this, my mind went to that assumption. I would definitely try to get him to open up. Clearly he has been through something tramatic. I hope you find the answers and I hope he gets the help he needs and starts to feel better. ❤️

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Mental health professional here. You need to take him to see a professional. And if the first one doesn't feel right, go see a few until you find the right fit. Don't go questioning him yourself because how you ask the questions is very important and can influence how he responds. Just take him to a pro and let them do the work.

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Not normal mama. That's some very unusual behavior. I would be taking him to the pediatrician asap.

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I agree it’s not normal behaviour and you need to talk to him and see if he will open up. You may also need to speak to his father to see if anything happened. Whilst it could definitely be an indicator of abuse, it could also be more innocent-there is a girlfriend and two other children in the house and perhaps they don’t gel as well as you’ve been led to believe. Maybe they’ve made a hurtful comment about his body, or getting dressed, or maybe they were invading his space or going into his room at night or telling him something that’s made him afraid. Kids can be really mean and devious too.

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I went to school for social work which is like counseling and at first the clothes changing I figured was normal and figured maybe his dad said something about him getting dressed and it undressed in front of the girls. But personally I would speak to dad to see if he has said anything or noticed anything different about his behavior and seek a therapist for him to check to see. I would not jump to conclusions because if nothing happened he can feed off of your attitude and assumptions that something did. When you talk to him I would not assume it make any accusations because you don’t know. But a therapist would know what to ask to figure it out.

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This breaks my heart 😔 But I fear something isn't right and you need to talk to him ASAP

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Updated!! ❤️❤️❤️

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Um yes hes definetly been abused. Do not let him over there anymore and question everyone and everything. Even the kids.