Hello! I read the question and understand your concern. In my opinion the troubles you have may be caused be a nerve irritation in this region probably sacral plexus S2-S4. I would like to know your age. This irritation may be caused by a lesion in the pelvis tumural or inflammatory, degenerations of sacral bone, a pathologic fracture of sacral bones from osteoporosis, or even a peripheral vascular disease. I would recommend further tests like a routine blood test, a pelvic ultrasound and a CT scan of the sacral region with intravenous contrast to examine all the structure of sacral region. In the meantime I would recommend treatment with gapabentine or pregabaline which is very helpful for your troubles. Hope to have been helpful! Best wishes Dr Abaz