wooooo man... yep, sounds like me when I was in school, i'd walk down the hallway all tense because of my anxiety. (before I knew it was anxiety [which developed the summer prior when I had played this MMO and didnt socialize at all with anyone])
anyways, my anxiety wasn't that bad then. it got bad when I smoked pot for the first time, (well, after a week of smoking pot) and then i had a full blown panic attack! yay. (sarcasm)
so anyways, stay clear of meds (SSRI's, i.e. paxil, zoloft, celexa, etc.) untill you've been to therapy, I suggest going to see a psychologist, it sounds lame, but..they really can be helpful. :)
all the symptoms you're describing, i've experienced, and i'm sure theres maaaaany ppl on this site thats experienced the same thing + more.
so dont worry, we're right there with ya. My suggestion is, do NOT withdraw yourself from social situations, continue to push yourself to be sociable. if you withdraw yourself it'll just make it worse. However, you have to learn to relax, you're a senior in high school, you'll be starting college soon (i hope) and you just have a lot on your plate. Dont stress. I cant emphasize enough, the importance of seeing a counselor/therapist/psychologist. keep your head up man. you'll be alright. Just remember, we ALL have those symptoms (well.."we all" being the ones with anxiety)
so come back and update us how you're doing.
Your not being a hypochondriac. Anxiety is a real condition.
All the symptoms you mentioned, alot of us anxiety sufferers go through the same thing.
Can you talk to your mom about seeing a counselor? Or maybe talk to your counselor at school.
We're here to listen. Take care. Remar