Pregnancy actually increases your chances of having your gall bladder go bad. In fact, it's common to have it go bad while pregnant, although they have to wait until you have the baby to take it out.
I take Welchol to help with my bile-induced diarrhea post-gall bladder removal. It works very well (even though there are still some foods I have to avoid). You could get your GI to try you on some of it BUT you have to be careful if you are also prone to C because it is naturally constipating. As soon as you start getting constipated, you would have to stop taking it, and not resume it until you started to get a loose stool again. You can use it that way--on an as-needed basis.
I found that diet does play a role in what sort of bowel movements you have. The standard American diet gives me D. But, if I go on a low-fat diet, I immediately get C. There's not happy medium that I can find with diet alone. So I eat a fairly standard diet and take the Welchol.
Your acid reflux may also be caused by your lack of a gall bladder; your bile may be reflexing up. I don't know what you can do about that but eat antacids (which won't do anything to stop the bile, but may either absorb and neutralize some of it or may reduce your stomach acid so there's not so much acid all together in there). You might try Questran, though. It's in the same family as the Welchol in terms of soaking up your bile, but it comes in a powdered form (as opposed to pill) and you mix it with water and drink it. So it might start absorbing excess bile in your stomach. I don't know if it will work that way, because, as far as I know, no one has prescribed it for bile acid reflux, but it'd be worth a shot. Questran usually causes gas, though, in people; something that's not complained about with the Welchol as far as I know.
The things I can't eat: caffeine, apple juice, raw apples. Things I can only have every great once in a while: deep fried foods, fast food. Things I have to be a bit sparing with: dairy, pizza.