Look on the main page, with lists of the forums.
http://www.medhelp.org/forums.htm
The Neurology and Neurosurgery forum would seem like a good place for you, but the doctor there has not answered patient questions for six weeks back.
That forum only accepts one or two questions per day....be sure to read the rules.
The doctor on the Undiagnosed Symptoms forum usually answers within a couple days.
Carol