@shooei It does sound like gall stones. I, and just about everyone in my family), had gall stones. Because I had/have a good diet, I was the oldest to have my gall bladder removed. I used to think it was my GERD or a stomach ulcer bothering me. I would get an attack of cramps/pain in the middle of the night so bad that I just would lie curled up on the floor in agony for about 20 minutes until it went away. (I would try to throw up. Sometimes it worked, sometimes not.) It would sometimes go away as quickly and completely as it came. (Supposedly, I passed the stone.) The last couple of times I had a week or more of constant back pain after the cramping episode. With the last back pain, I finally went to my doc, who sent me to the ER for an ultrasound. They sent me directly to the hospital and my biliruben was high from a stone plugging my bile duct. When I had the laproscopic surgery, the surgeon said my gall bladder was "filled with about 500 stones." I had one attack after the surgery, but now I'm painfree--at least from that issue :-).