Constant aching pain and weakness in legs

Posted By Mellie on November 24, 1998 at 11:08:08:







My son, age 37 developed aching pain and weakness throughout both legs (calf and thigh, front and back).  The pain and weakness began in May of 1997 and appear to be getting worse.  The symptoms are constant, varying from moderate to severe.  Walking as far as one city block can bring severe aching pain that lasts for several days.  He describes the pain as being similar to muscle fatigue after running a long distance.
He has been to many different doctors including two neurologists and has had extensive blood tests, a muscle biopsy, MRI and EMG.  The blood tests are in the normal range except for an elevated billirubin count (this has also shown up in earlier blood test).  His blood pressure is always low.  All other tests failed to produce any diagnosis.  He is currently taking Dilantin.  It does not seem to he helping.
He does not smoke or drink alcohol (never has) and eats a very low fat diet.  The only injury to the area that we can think of is that when pain began, he was riding a stationary bicycle several miles a day.
Can you suggest:
1. any course of action that we could take to diagnose and treat problem
2. any help in controlling the pain
Any information or suggestions that you have will be greatly appreciated.