I know it's a bit unfair to judge people on stereotypes, as we are all individuals but your ex being from a traveller background does explain some of his attitudes. Whether he holds the same ideas or not, he's likely to have been brought up seeing them or under them.
They are much more likely to be violent towards females and expect the males opinion to be gospel. They also tend to expect the women to be there to serve them etc. Education can be seen as unimportant and would also be a reason for him not to value your daughter's interest and aspirations to study criminology.
I think that your mental health team are correct. Often DV tends to increase in frequency or severity over time. The fact that you couldn't access an ambulance when you were seriously hurt, is beyond terrible and shows that he was more concerned about himself than you.
Although you have every right to contact the authorities, I can understand why you don't want to antagonise him or his family. You have to be smart and get the best result for your kids.
I'd also advise you to keep good records of every meeting you have with school and who you spoke to. Email yourself the gist of the conversation and any plans they have suggested. He's actually doing you a favour by manipulating the rules, because it's going to count against him when he's facing a judge. Having a clear factual account, and being able to prove when certain things happen, can be very important. Feelings and attitudes can be disputed, but facts can be proved.
Really sorry that you aren't feeling well. I think I have turned the corner and am starting to beat this nasty cold. Hopefully you will start to feel better soon too. 🤞
I loved seeing your scrapbook page and it will be so lovely to see it getting filled with special memories of you and your kids in your new home. ❤️