I get you. I'm in late stages recovery for anorexia and I start uni in '25, and have similar worries to you. If you feel comfortable doing as such, maybe ask your uni for help. They may be able to provide you with someone who can support you and make sure you don't relapse, and maybe even make provisions for living/flatmates. You never know, your flatmates may turn out to be supportive if you decide to communicate the situation to them and what you're worried about them saying (only if you feel comfortable telling them though), but if not the uni may be able to find you somewhere else.