I have pain in my lower back can anyone help?

I am facing this problem from 5-6 years. I have a pain in my bones which are underneath my buttocks. I dont know what that bones are called. When I get tired phisically then it pains and I cant point out the place of pain...I feel it is somewhere inside ...I cant even message there....It pains so bad that I cannot... show more I am facing this problem from 5-6 years. I have a pain in my bones which are underneath my buttocks. I dont know what that bones are called. When I get tired phisically then it pains and I cant point out the place of pain...I feel it is somewhere inside ...I cant even message there....It pains so bad that I cannot turn around while sleeping or get up from bed. My doctor keeps giving some pills but they dont work.....Please help
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