I've been smoking for about 7 months, I'm about to turn 18...please read thoroughly.?

I quit smoking for good today, I don't need them anymore...I've been smoke free for almost 6 hours now and don't feel like smoking at ALL. I'm worried though because I've had chest pains, I haven't been smoking that long, and also, I didn't smoke every day out of those 7 months and I didn't grow up around smoking so my body isn't use to it I suppose...I don't plan on smoking again...I'm a true hypochondriac as well and am worried about my chest pains...could this be my body not used to smoking???? Hypochondriac worrying? I just got over the Swine Flu so I mean it could be mucus and stuff bothering me right? I'm just worried. RN's and Doctor's prefarably answer this question. I don't need a lecture, please. I know what I did was very harmful to my health, I understand that...I don't need a lecture.