These things vary widely from university to university.
This is Gold's disability department. I would suggest contacting them and finding out what support could be available.
If it seems like they aren't right for you then maybe try studying A Levels at a local college to widen your options and get into a university with a better disability service.
I go to a different uni, and I have a social mentor and a professional mentor to help me stay organised, reduce stress, and come up with study strategies.
Well if the disability support is good then I don't see why I can't go straight onto this foundation degree rather than study A-Levels for nearly 2 years. I love anthropology and did Humanities at GSCE level last year and gained a C nearly a B.