I àm 69 yr old woman. I have hadboth knees replacec, 2 yrs and 4 yrs ago. I am experiencig tremendous nerve pain down both sides of both legs. I have been to a pain mgt doc, horrible experience....physical tberap.no help. I have tried Lyrica, nope, my internist has me on Gaberpentin. I have tried this before, tryig it again. I simply cannot sleep at night for the pain..a y thoughts?