M.P.
Gallbladder attacks are caused by a stone or stones trying to pass through a small vessel. I doubt there is any way to make them smaller or to stop their growth. Your attack is over once the stones pass through. Your attacks are so horrible because the stone (s) are too large to smoothly pass. One day, you will get a stone that won't pass and you'll have to have surgery to remove the stone. Surgery will affect the baby because you will have to be anesthesized. That means baby will also be anesthesisized. You may not even be able to have surgery.
Your pain at the level it is now may also affect the baby because the baby will feel the affects of your body trying to deal with the pain. There are very few options for pain medication when one is pregnant.
Good you're going to talk with a doctor. Does this mean you haven't talked with a doctor about your gallbladder issues? If so, I urge you to see a specialist now. A gastroenterologist can explain the situation and how it affects you now. If appropriate, he can prescribe a pain medication. He will tell you how this issue affects your health now.
My mother had stones. The doctors smashed the stones with a devise without making an incision . Then they passed naturally. My mother was in her late 70's and had a serious heart condition and yet she recovered quickly.
I suggest letting this issue continue can result in a more serious issue. See a doctor.