There were few times I experienced a sharp sharp pain across my middle waist and in my back it was a ring of pain it was so extreme I could barely breathe and i felt when I was going to get an attack of that sever pain that left me gasping for air and contracting in pain and cold sweat. I really dont know what this can be but its scary and it does not happen often but when it starts those attacks can happen over week or two and the attacks last for minute two minutes and its very extreme at a time i hope i will pass out so i dont feel the pain.