Gabapentin
"I have CFS with neuropathic pain in both legs, the pins and needles, shooting burning pain and feet that are either freezing or burning.
I was intially given Amitriptlyne which worked very well but left me with a hangover in the morning, not good when you have to drive 50 miles to work at 4am. 
My Neurologist put me on Venlafaxine which again worked but gave me too many side effects.
Gabapentin was prescribed by my GP and within a day my walking went from a 70+ Y/O to a normal 53 Y/O, my dose needs increasing now as I am only on 600mg daily and I am struggling again. Best drug ever with no noticible side effects - UK based"