restless legs syndrome
"I was started on Gabapentin 5 days ago.  Began with one 300mg pill a night.  Have not had more than 3 hours of sleep since I stopped taking my other medication.  I am going to up it to 600 mg per night to see if it relieves the pain and leg jerking.  I am near my wit's end.  I have suffered from restless legs syndrome for over 30 years."