Just two months ago, I went on antibiotics for a bladder infection, and I heard that lower back pain came with it, although I never experienced this. Well, just a few days ago, my upper back started aching and usually arching my back - causing the joints to crack - helps, but now, it's gotten worse, in a 24/7 nonstop kind of an ache, and I really can't crack so many joints every minute. My period is scheduled any day now, and I've got some numbness in my thighs indicating this as well. Thanks for helping!