Food is not my friend

During this past summer I was a bit stressed and quite often lost any appitite I had, and when I did eat I would start throwing up and suffering from sever body aches. Now that I am back home (my dorm is my REAL home) and started classes I have begun to relax. The body aches that were plauging me have almost completly abated and I the stress I am under is minor and easily managed (school has always been pretty easy and delightful for me). But I'm still getting sick almost every time I eat and have little desire to eat. My friends are being worry worts about it, but because it happened all summer, and besides the vomiting, i feel fine. What should I do?