14 year old struggling to adjust to move

We had to move because my daughter was dealing with severe bullying and I also found out that my son to be ex husband which is my son's dad had been sexually abusing her. So he got arrested and my son to be ex step daughter has made the bullying worse and my daughter wanted to kill herself. She's 17. She's adjusting ok. My ex plead guilty and got 40 years. My daughter is doing cheer now and made some good friends. My son is not adjusting very well. He is high functioning autistic but he's struggling through a lot of changes. He went from seeing his dad daily to now never being able to see him again. He had to move away from his friends and he hasn't made any new ones and we live somewhat near train tracks so they sound overstimulates him. He's very upset that we had to move and no matter how much I explain why he is struggling to accept it. He had a breakdown in his school during winter break and started crying in class and hitting his head because he was overstimulated and didn't have his friends with him. He's still not used to the new home and change in his routine so he won't get up to go to the bathroom at night and instead just pees in the bed which causes more morning problems because when he wakes up the feeling of his bed sets off his sensory issues. He says he wants to go home and he is having such a hard time accepting that this is home now. I am really trying to be there for my daughter because she's been through so much. And I think his issues adjusting are making her feel guilty. How can I help him adjustm