severe leg pain in the am. was walking 3 miles per day, started short jogs knee cap popped, stop walking.severe back pain, occasionally heart will pulse fast at times,skin on bottom of heal of feet, no feeling, oh get this, can gain 4 lbs in one day,find this very strange.also if i sit in a chair in my office, legs are very week when i get up, then clears some what.notice back pain starting, also have been on lipator 3 plus years