What's wrong with me now?

i have been sober for a month and by sober i mean smoking weed. and one week ago i went to mexico with my parents and got the flu.(no not the swine flu, but i got better a couple of days ago and now i over think things, and thinking only in the consequences. now i am scared of dying. also i sometimes lose my appetite sometimes. but i also think its anxiety but im not sure and also this girl im not so sure about anymore if i like her or not that also makes my stomach hurt. and also when i lay on my left side of my body my heart started to hurt. and in the morning i couldnt really feel my left arm and side please help will these feelings go away. by the way im only 14