I thought I'd give a little update, since everyone here was so helpful and patient with all my questions last month.
To recap, I had my gallbladder out two years ago, but didn't develop diarrhea right away. It was about 6-8 months ago, that it got really bad (in urgency and frequency) for me. I finally saw my doctor, who referred me to a GI, and his dx was IBS due to excess bacteria (I'd had strep treated with a standard course of amox in Sept of last year). He doesn't think it's at all related to having the gallbladder out.
He recc'd flagyl, heavy probiotics, and Fibercon.
I'm pregnant, so I declined the flagyl, because my problem is "just" urgent diarrhea, even though it's daily. I don't have pain or a sicky feeling or anything. I was/am uncomfortable with the flagyl at this time, because of the risk/benefit ratio.
Anyway ... it's been about a month. I take two capsules of Floragen3 probiotic every day, plus two Fibercon pills twice per day (yes, four Fibercons per day).
My symptoms are much improved. I generally have one episode of urgent diarrhea right after lunch, and then it's done. Before, I was going 4-6 times per day, every day and sometimes more.
As an added bonus, a few times per week I have an early-morning BM that is SOLID. I can't believe it when it happens, I get so excited. Seriously, my last solid bms were in November. I don't know if it's just me being weird, but just knowing that I'm still able to have normal ones is comforting.
So that's my story. I'll be keeping up with the probiotics and the Fibercon indefinitely. I think I'm at a point where this is just "me" and there's not necessarily something wrong anymore. I might try the flagyl after I deliver, but we'll see how things go once the hormones and everything settle down.
Thanks to everyone who helped me along the way.