First thing that comes to mind is Periostitis and that does take time to resolve or a tendon or ligament injury. What did the physician recommend you do as far as activities? I can't see further damage happening so long as you are careful. Are you stabilizing it at night with a splint?
There are no experts here, but it sounds like to me you're certainly enriching the medical establishment. You hurt your wrist when you fell on it. It takes time to heal. Did anyone tell you to ice it and elevate it right after you hurt it? Anyone got you on ibuprofen or other anti-inflammatory? Sounds like you fell on it hard, got a bad result, it's not broken, and you're just being impatient. That's why the wait for the MRI -- you don't really need it and the docs know it. Now, I can't say any of what I just said is true -- lots of hard to find things can go wrong with the human body -- but everyone has told you it's not broken, if it was you'd notice a lot of swelling. You're not young anymore if your profile is correct and you're 54 years old, you won't heal quickly anymore. Wait until you're 64 like I am and you're sidelined more often than you do anything. Exercise causes injuries, they build up, and you just need to let it heal. Anyone send you to physical therapy for massage and strengthening to speed this up?