How can i find a doctor who is willing to help me?

I've been to see roughly 30 doctors and all of them refuse to believe that i'm having a severe side effect from tablets i have to take for the rest of my life. They all said that it's not possible to get this side effect, even though it lists it in the leaflet of the medication. No one else can solve my problem, only a doctor but i have lost my faith in doctors and am extremely angry at them for not helping me. I don't think i could stand the disappointment of another doctor not helping me. what should i do?