My friend has had pain the the buttocks when sitting for the last 16 months. He has had several MRI's and has had different diagonisis. One diagonisis was piriformis syndrome, another has been possible myofascial pain. Some doctors have flat out told him they don't know what is really wrong. Some doctors have said he has peripal nerve damage, but there seems to be no cause for it. He is extremely frustrated. Prior to the pain in the but, he was walking about 6 to 8 miles a week and was very active. He had a sinus infection and was in active for several days and the pain the buttocks started. He is on pain medication and nerve medication, does any one out there know of any similar case. The MRI show no problems, no tumor, not pinched nerve, , they show nothing that could be causing this problem, blood work shows no sign of infection. He did have slightly low vitamin D level and is currently taking vitamin D. Please help. He also has pain in his feet and has been told he has Morton's Neuropathy. He is very frustrating because he stands to relieve the pain in the buttocks, and then his feet hurt. Please help!