I'm on the Welchol myself. My gall bladder will have been out 5 years in February and I have D if I don't take the Welchol regularly.
However, it does take everyone's body 6-8 weeks to adjust to not having a gall bladder. While I very much recommend the Welchol to people who have D after that point, I would recommend that you tough it out until then. That's because your symptoms may change radically between now and then. A few fortunate people's symptoms clear up totally, while some's D goes away, but heartburn replaces it, or some people can switch over to C. So I'd recommend that you wait and see what course of action your body winds up deciding to take, then treat that. After 6-8 weeks, what you're left with is pretty much what you'll be like for a very, very long time.
Also, right after I had my gall bladder out, I had to be VERY careful about what I ate. Doctors who tell you that you can eat anything you want are lying (or just don't know any better). Eat bland food (no Mexican or Italian, much less Thai), and avoid meat. The only two meats I could tolerate just after my surgery were fish and chicken; pork and beef made my guts worse. Also no caffeine--including no de-caf coffee, which still has too much caffiene in it. Also, stay low-fat. After the 6-8 week mark, you should be able to add some of those things back in. I can have spicy food and all forms of meat now. I still can't have caffeine, though, and I have to be a bit particular with my fats. I can't do fat from fried foods, but fat from dairy seems to be okay. Basically, I had quite a bit of D after my surgery, but when I figured out what was making it worse, I changed my diet, and was better. After a while I was able to add most stuff back in (caffeine, though, had been a trigger for my gall bladder attacks even before I got it out). But it was the Welchol, really, that allowed me to go back to an almost normal diet (I almost never eat fast food and I can't tolerate eating out more than once every week or two--food like that is too greasy).