Faint at needles, please help.?

I'm 19 now, but when i was younger, up till around 13 i wasn't scared, ans i didn't care or faint or anything. But then i got an injection when i was 16 and i fainted. I think it's since i stopped going out. I stopped going out for like a 2 full years and hardly talked to anyone. After this 2 years i started going out again and socializing, but then i had problems, like a lot of anxiety problems, and turned into a hypochondriac, and id start going light headed when i hurt myself or getting ill worrying. Whereas before i wouldn't really care about pain or infections and such (I was kind of stupid). Anyone know what helps? Preferably someone qualified. And sorry about the grammar/spelling. I'm no good at it lol