This question is in regards to my boyfriend who went to South America about 2 years ago. He spent 5 months there, and at one point he became very ill. It sounded like regular food poisoning symptoms; horrible diarrhea, being weak, shaky, unable to move for a day or so. He said he got over it alright, though.
Now, 2 years later at age 24, he is lactose intolerant (beginning immediately after this bout with sickness, he used to drink milk like crazy), has noticed a long-term change in the frequency (I think more often) and texture (err, I guess they're softer) of his BM's. Recently he started getting horrible stomach pains for no apparent reason, and he tells me there are black "chunks" in his poo (he didn't get much more descriptive).
The whole thing sounds strange to me, and I was wondering if he may have picked up some sort of parasite while perusing the southern hemisphere. He does have a doctor's appointment (after a little nudging) later in the week, but I was curious if anyone had any input or experience in a similar situation. Thanks!