I had this after sliding down a short flight of wooden stairs on my bum. I looked into treatment options at the time and there were 3. these were pain relief and patience, steroid injection, and manipulation. All three had about the same cure percentage so I opted for the least invasive. It took about four months to clear up completely. Taking the weight off your coccyx by sitting on a firmish cushion with a U shape cut out of the back was helpful to me, I made my own by buying a piece of firm foam from an upholsterers and cutting out a piece of it. Don’t use memory foam, use the kind called “orthopaedic” or max firm.