Hey hun, firstly welcome to the ED Board!
I'm sorry that you're feeling so bad hunny, but without your present hun, you don't have a future. You're still young and there is plenty of time to go to Uni and stufy the courses you want to learn. But right now hun, you need to look after your health and happiness. If the people in your support network believe that going back to hospital will help you hun, then I'm sure that it's the est thing to do.
Stay strong and have hope sweetheart, things will get better, and YOU will get better.
I hope you're ok, stay safe