Sleep and behaviour help needed!

So this is gonna be a long post, and I apologise for that but please read it all.

We recently came back from a holiday abroad (visiting family), it was the worst holiday of my life. If you can call it a holiday at all. Before the holiday my son started being a bit more clingy and fighting us slightly at nap times, I'm pregnant and he's almost 14 months so we just figured it was normal. During and after the holiday however he will not go to sleep without me at all, wants me constantly, screams when he doesnt get what he wants instantly. He's like a completely different child! Hes always been a really good and easy baby, we could change him and feed him then lie him in his cot and he would go straight to sleep. He might have an occasional melt down but he would get over it fast, now it's pretty much all day and me and my partner are going insane with the constant screaming and lack of sleep.

During the holiday he had to sleep with me for the first few days as we didnt have a cot (family had gotten rid of it without telling us), he also got given everything he wanted because the family we stayed with believe that letting a baby cry for 30 seconds is child abuse 🙄.

I don't know what to do. Everything that used to work has stopped working, I'm exhausted due to pregnancy and have no free time to unwind because I have to go to bed with my toddler and wake up with him. My partner is losing his mind with the screaming every time our son is in his arms (because he only wants me). Were at a loss and if we could just get him to go to bed how he used to I could deal with the awful naps and screaming.

Does anyone have any advice? He still sleeps in our room, his cot is open on one side because he was sleeping better like that before. He is also refusing most food so if anyone has any advice to get him to eat that would be great (he is still breastfed but at 14 months that isn't really enough).

Photo because he's still cute 🤣