I've been having these myoclonic (jerks? convulsions?) Meh... Don't know what to call them - but they sure are annoying. When they happen, my legs get really weak. It also seems to be associated with back pain - upper, lower, lumbar. On top of that, I can't feel my knees. They're numb to the touch, but more importantly, when I walk, I can't feel them. I can feel the pressure in my calves and thighs and feet, but not my knees - they're buzzy and floaty.