--given your cycling hisotry, there should definitely be some investigation done in the areas of the lumbosacral spine and its attendant nerve roots, and along the cauda equina--the "peripheral end" of the spinal column.

There are so many places nerves to the sacral area and lower extremity can be compressed--in the spinla column itself, along the pelvic girdle, near the pubis, even along the upper part of the thigh structure--that a good series of imaging studies would make sense. Moreover, "double crush phenomenon" effects are very common in this area--a metabolic/autoimmune or other compromise to nerve that is not producing much in the way of symptoms is then exacerbated by mechanical compression along the nerve, with the result that the symptoms become greater than the sum of their component parts.