I would also like to add...Wash your sheets etc. make your bed fresh (get like Tide with Downy. (if you can handle light scents.... it makes every thing smell so fresh) and fix your room nice and your bed. Keep your room cool. Put loose fitting clothes on and try to play this http://www.youtube.com/watch?v=n0IOf08pTRc put your earphones in as you fall asleep. It has been really helpful for me. I'm not good at meditating but this is helping. I don't make a huge effort, I just listen and relax.
If you were my child...I would hug you and tell you just what I have told you here. (I'm 45 a mother and the truth is I haven't told anyone and all I want is a hug and a good cry with my mom!
Stay in school, go to the clinic (they can give you something for the itching, try to speak with someone with experience in the clinic. College (under any circumstance) and worrying will make you constipated....it happens when our bodies are stressed and in a new environment. Drink prune juice with a little apple juice, ice (need the ice) and mix it together. Go slow, a cup in the morning (see how that goes) then try adding a cup at night if you need it. Take a walk...it will help. I also would suggest looking into taking some vitamins.
As two wise ladies on here told me......you need to love yourself and give yourself the attention you wished you got from someone else. Learning to control this and just making it a part of your life will do wonders. Don't let it lead your life or define you. We can all navigate this together..collectively we can heal our minds and souls. Thinking of you~and sending hugs.