When there is atmospheric change, my body pains lot , why?

i am 21 yrs old, i m healthy and there is no any other problem in my body. But whwnver there is any atmospheric change i fill so weak that i have to take pain-killer to get a rid off pain. now a days summer is going on but since last two days there is cloudy atmosphere and this trouble me alot. Please tell me why does this happen and what i can do to solve this problem