Excision of a carpal bone.
carpectomy
I had a similar case, but let the pain go on for over three months. Eventually I went to an Orthapaedic center and got an MRI and X-Ray. I had dislocated my Lunate; which is one of the eight carpal bones in the wrist. Unfortunately, this can only be fixed with surgery. You can either have them reposition it and put in a rod until it heals, and this is the best option if it's early in the injury(not 3 months). Or, they(surgeons) will just do a carpectomy; which is where they will take out a row of four carpal bones. With this, your wrist will shorten by about half an inch, and from experience, this is the more successful of the two options. You should get an X-ray and MRI asap.