I had my gallbladder out at 19. I wasn't overweight at that time so with the first attack, the ER gave me pain medication and sent me home. The second attack had me thinking I was going to die so I made my "death bed" confessions to my mother, asked her to give my siblings certain things of mine and wrote a letter telling everyone how much I loved them. I passed out from the pain! Fortunately, the next ER decided to do an ultra-sound sound on my abdomen and I had 3 very large rocks in my gallbladder! Surgery was scheduled for a few days later.
Now, besides having to answer to my parents for some of my confessed mischief, I think that having those attacks were the best thing that happened to me. From what I hear from others, the attacks happen more frequently and are worse. Had I known that I had gallstones, I would have never waited for the pain... it's not worth it. Get the surgery.