When I had gall stones, I had that constant pain in my back as well. It always felt like a knife was being shoved through my back to the front. The most horrible, annoying pain. I also would get it after certain foods, and for a long time I thought it was heart burn so I would drink bottle after bottle of antacid. Sounds to me, like you are having the same pains I did. And the surgery helped so much. Good luck! And just a word of warning, when you have it out, it is still very possible to have attack pains. I thought they didnt take out my gallbladder because they were so strong, but they call them phantom gallbladder attacks. Hope you feel better!