Hi My Name Is Johan. Went For A Sonar And

Hi my name is Johan. Went for a sonar and they diagnosed gallstones. I have a date for surgery on the 19th July 2016 but am in much pain. Went back to doctor yesterday for a 2nd opinion. He prescribed hyospasmol. I've been using bevispas, gaviscon caps, agiolax to make stomach go and dulcolax suppository. I have a lot of pain on the left side, it almost feels like i have a pain on my heart and below heart. What can that be? What can i use to stop the pain. Sleepless nights...