Sever pain in back of hip (any advice would help)

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So not sure if this is the right place sorry If it isn’t.

My hip like in the back close to the spine area is hurting so bad I can barely put weight on it. It send pain all the way threw my leg an tail bone. I shake so bad when I try to bend or any thing else. I’m not sure what to do or what could be causing it . Started a few days ago .