I get very bad pain in my lower back sometimes too.I thought it was sciatica but I think mine is caused by either standing still or sitting with pressure on one area for too long and a build up of fluids in that area.once I move or stretch and get the area moving the fluid seems to unblock.I use a magnetized heat waist belt at work that helps alot.It heats up with your body and has magnets inside.they are very cheap considering how I cant live without it.