Help with Homesickness!?

I get very severe homesickness. Last year I went to camp for 7 days. It was horrible. I felt very depressed, I cried all day, the counselors had to make me eat, and it made me physically ill (headaches, stomach aches). I was so embarred. Then a few weeks ago I had to go to camp with some clmates. Same thing. I couldn't eat anything, I cried all the time, and it was horrible. It was beyond mortifying. I looked up tips to help with homesickness, and they all said things like "have a parent send you letters everyday" (she did), "Bring something to remind you of home" (I did). I'm going to camp next week. I had a panic attack yesterday. I am so embarred. Please help!