What Should I Do About Persistent Tailbone Pain After Taking Calcium And Vitamin D3?

Sir I m facing tailbone pain from last 6 to 8 months.. But I didn t fall or anything like that. My age is 20, I visited a doctor who took my back xray and told me everything is fine and prescribed me some calcium and vitamin d3 tablets but, after stopping taking tablets my pain starts again. What should I do sir.? Please sir help me..!!