I have gallstones, and was due to have my gallbladder out two weeks ago, but operation was cancelled by hospital. A day before my scheduled op, I was in casualty with the same kind of pain you describe. I could hardly walk. They gave me a shot of Volterol and Buscopan, and sent me home with a prescription for antibiotics. They reckoned I had mild cholecystitis. The pain continued anyway, and is only now just going away. The problem is that in July I was in hospital for 10 days with acute pancreatitis, and I'm scared it will happen again.