I had my gallbladder removed years ago. You can avoid foods you know will trigger it, and try to eat a low fat diet. While in a flare, I was told there's not much you can do except take some pain killers. I also found walking helpful.
If you have gallstones, there are drugs you can take, but probably not during pregnancy. From what I've seen they may do surgery during pregnancy, but only if your gallbladder is getting inflamed, otherwise they may try to control with diet. Definitely go get checked out! I know how bad it hurts ((hugs))