unsure about who i am?

i'm going through a crazy existential crisis, here's a bit about me: i'm 18, i got kicked out of school (not that it really affected me that much), and never had anxiety before this last month and a half. so, i went away on my last weekend trip with this youth group i was involved with for almost a full 3 years, and when i came home, i got bronchitis ( i was heavily smoking pot and mixing it with tobacco, as well as taking edibles on a daily basis ), so obviously that had to stop. i'm very small, i lost a lot of weight in the last two years, and had to be on anti-biotics for my illness. things start really going downhill from there, i couldn't finish my anti biotics ( it was for 5 days, i only did 4 ) and since then i've had insane insomnia ( in the past month and a half i've had a handfull of great nights of sleep ) and the insomnia comes with this sudden, onset fear of dying. i feel odd and out of place in my body, like i'm not supposed to be here and i've self diagnosed with every possible medical disease. i see a psychiatrist and will start seeing a therapist, but i've started twitching in my feet, my right arm and generally side of my body feels more active than my left, i'm constantly dehydrated and hungry and i eat very well balanced. i've lost a lot of hair and my nails have turned pale and i've stopped really seeing my friends. i'm so scared and i feel like i'm in the wrong body ( if that makes sense ) and that i'm going to die. which is completely irrational, but i can't stop.

i was put on seroquil, and got off that. then i was put on 900mgs of gabapentin a day, though i only took the 300mgs at night because i've been a little scared of overdoing it.

I think you let yourself get run down,which got you sick, and you started to worry, hence the anxiety,and that's the reason you can't  sleep. Now your all worked up about it. Why the psychiatrist, and therapist. With nerve's,some people eat, and some people don't. All the twitching is anxiety also. Anxiety and panic is gloom and doom, and we just know were going to check out. I am not quite sure about the meds your on. I feel like i'm missing something.With your hair falling out, and your pale nails, it sound's like a defiency of some kind. I would call my family doc, and have blood work done,and see what that shows. I'm not sure why you need the therapist, and psychiatrist.  I also am not agreeing with the meds your on. I am kinda confused.confused    I think your family doc or who ever you see , is more than capeable of treating you.

If all of a sudden your body was in fantastic health and shape..let me ask you..who are you? What would you do?  I can tell who you are not..you are not just a "body" you are more then your shell. So answer please..who are you?