How to get over phobias?

i need to get over my phobia of neeldes and doctors...i am petrified of them, when i p in front of a hospital or clinics i get panick attacks, like i feel faint, palpitations and very sweaty...i want to get over that...i cant even go see my friend in the hospital! this is crypling as hell and i really need a solution! plz if u had this and got cured or know someone or any suggestion at all..plz tell me...this is really hindering me living.