abdominal pain and diarrhea 4 days after food poisoning

hi,
im currently in south america and got food poisoning from eating something bad on sunday evening - I slept very bad and on monday i had to vomit three times (morning, afternoon and evening).
since then, for the last 3 days, i dont really feel sick any more, but i still have abdominal pain from time to time (usually in the evening), diarrhea and have to fart and burp a lot... and it doesnt seem to get any better. I eat very little since i hardly have any appetite.
is this a "normal" effect of food poisoning or should i worry to have something more severe?
thanks for any reply,
Jan