Rough couple of days

This is a rant ....

My 12 week old has been super fussy and not sleeping well. I have a 7 year who has horrible ADHD and anxiety and since baby he won't do anything on his own. I go back to work soon and my anxiety level is at a all time high.. fighting my depression. I am terrified of doing anything with my son ( baby ) changing him , bathing him even laying home down. I am so nervous. My bf is great and helps when he is home and his mom helps . I just feel like i am a mess . It feels like everything with the baby is brand new like i never had a baby before.