Bella,
you & I have talked before - you have to realize that your problems didn't just happen out of the blue & so you won't be healed out of the blue either. It will take time, alot of energy, willpower, help (from friends, professionals etc) & you will go backwards sometimes.
Uni work will stress you, that is normal, whether others show it or not, they do (& are) get stressed (unless of course they don't care & are happy to fail!!). My daughter has a very high iq, is very organized but she is also stressed out about uni & she is hell to live with (there are times when I truly wish she's move out, be anywhere but here!!). So feeling stresssed about uni is ok. What you have to do, is try (repeat try) & keep on top of things by setting up a study programme & as far as possible sticking to it, but you must include in it, some time out, movies, plays, walks, time with friends etc. Or the tiredness & stress will eat away at you (excuse the pun) & you will go backwards & feel bad.
A couple of years ago I took to both arms with scissors, something I never thought I would or could do, but we can all do things we never think we can, it just takes the right set of circumstances at the right (or wrong!) time. I can't say i'll never do it again, but I promised myself that I would seek help & I did (which you need to do) & that I would remind myself how lousy I felt about it any time I thought of doing that or anything else stupid again. So far well I am alive & so are those around me!!
Go & see a counsellor - is there a student union/guild or similar there, here they have counsellors who can help guide students on any matter, medical, personal, legal, etc etc - & it's free. So try that, if not look in the local phone book for eating disorder support groups &/or see a dr - not my favourite people!! But with self-harm & not eating etc maybe it is necessary.
Please also smile as often as you can - pull funny faces in the mirror at ourself - that should help you smile!! Smiling releases chemicals in our brains to reduce stress/anxiety/depression.