i have been taking it for back pain for about a year, i notice i ...

i have been taking it for back pain for about a year, i notice i sleep really great when i take it, now for the side effects, i noticed that my lower back really hurt if i tryed to walk, or clean, i was in a great deal of pain, also i had pitting edima in the legs, very bad, , and a rash on the neck, and no energy at all, its been a week now since i quit taking it, the back pain is gone, i can walk around the block now, the rash is going away, my blood pressure is going down, i am happier and not mad all the time now. also have more energy