I have been experiencing tailbone pain from mild (unable to sit comfortably) to severe (pain sustained while standing, sitting, or lying down) for over a year. No injury to the area. the pain is constant, yet flares up at times to an elevated pain when no change in position will help and the pain shoots into my hip lower hip bone/joint. as of late I have been getting painful numbness/tingling up my entire back and into my head. I do have Graves disease and Hashimotos and know I am susceptible to more auto immune diseases. wondering if the above symptoms should cause me concern.