Dear B, youall are dealing with very difficult stuff! My 1st guess on the jaw pain would have been a fracture, but that should have showed up on xray. Some people have pain in the jaw area as a result of the radiation after effects, nerve damage, etc. But his overall poor health is certainly a major concern. Is he getting IV's at rehab to boost his hydration? When my husband started falling alot, it was due to plummeting blood pressure upon rising from a sitting position. He broke the implant in his jaw during one fall. We have this problem continually and haven't found a solution yet. When this happens to him, sometimes he has seizure like symptoms and it scares me crazy! I know you are frantic about what is going on and I'm sending you a firm hug and a prayer for strenght. If you think going to Dana Farber will help you-by all means-go! Amy in the Ozarks