You have rightly taken break in dance. Vertebral column and spinal chord are affected due to extreme postures or shocjs and the portion of V.column say lumbar, sacral , cervical etc which is affected, give rise to nerve pain of those regions which radiates along supply area of the nerve. Tailbone is in Coccygial region. There may be multiple spots affected. Relax the muscles. Get checked for any intervertebral disc space reductions or other problems for vertebra. For the time being bath with warm water. Try to drink warm water. Avoid cold drinks etc. Avoid physical and mental stress. May apply gentally any muscle relaxant on the back post hot water bath. Avoid A/C. Hope you will take these initial steps instantly. Upon knowing investigation repirts, will guide you natural methods and herbals to regain strength and avoid pain. All the best.