Gabapentin
"I have fibromyalgia and severe arthritis.  This medicine is the only thing I have taken that relieves some of the pain and makes life tolerable.  I take 300mg, three times a day and will be increasing to six times daily shortly.  The drowsiness side effect is somewhat bothersome but doable.  My main complaint about it is that I have what I call drifting thoughts and they are very abstract thoughts.  I have learned to somewhat manage them but am worried that they will increase with the increased dosage as will the drowsiness."