m&ms, I'm glad to hear the diarrhea has begun to subside! Although you know that living in Bolivia, you are likely to see it again...and again...and again! The worst D I ever had was in Bolivia, 30x/day, literally non-stop for three weeks. Gads, I hope you don't go through that!
As far as post-infectious IBS goes...that's what the Mayo docs thought was wrong with me after my repeated parasitic infections. The infectious disease doc said that if these infections are severe enough, and occur frequently enough, they can forever alter your intestinal lining and cause long-term problems.
If you think about it, I'd venture a guess that the VAST majority of people living in developing countries have chronic diarrhea as well. I think it's just a way of life for most of them, and nothing out of the ordinary. m&ms, you and I have joined the ranks of millions, perhaps billions! More people die from the dehydration resulting from chronic diarrhea than perhaps any other affliction. Now, if we could just pump a little bit more money into developing programs for sanitation, health education, rehydration, etc. instead of pouring it into the hands of big for-profit drug companies who are developing drugs to eradicate women's facial hair, maybe things would start looking up!
Sorry, do I sound bitter??? It just drives me batty that so many people are sick and all some people can think about is what will make the most money.
Now, off my tangent. Probiotics might do you some good, although they didn't do much of anything for me. Limiting your lactose ingestion could be beneficial as well. Taking anti-spasmodics for the pain might help. In the long-term, it's going to take some effort, energy, and above all, PATIENCE to learn about how these little buggies might have changed your guts. BUT - there is a definite chance that things could just go back to normal! So don't lose heart!