Billye, I am so sorry to read that you are suffering so much, it's just not fair at all, i am wondering if a T.E.N.S machine may be of some help around the tail bone area, i mean using it in conjunction with what ever medication you need.
I was using a very similar device to a Tens machine before my hip replacement operation [plus very strong magnets], they both did help with the severity of pain.
I really do hope you can find some relief from this awful pain soon.
take care
Brian