Holy cow!!! You've got so much going on.

Whatever happens, you have to put your health first. If you aren't healthy b/c of the eating disorder or other health problems you won't be able to do your best in school anyway.

College professors are usually pretty flexible... I recommend you go talk to your professors as soon as you can to introduce yourself. You could try to explain some of the things you'll be dealing with a lot this semester. Just make sure they know that you'll work as hard as you can but might need a little extra help. Most professors will allow you to take make-up tests and give you extensions on assignments. (I guess they might ask for a dr's note). And then when you get into class try to meet some of the other people and see if anyone would be willing to help if you ever need it.

I know it can be hard to reach out for help but it sounds like you need support (not just from doctors and therapists). Most people are glad to have the chance to help someone else.
Maybe you've thought of all these things....sorry if I'm not very helpful. It sounds like things might be overwhelming for you right now.
I wish you the best,
ktgirl