Can food poisoning/gastroenteritis cause severe lower stomach cramps w/ bloody diarrhea without vomiting or nausea? i was treated with iv & then was fine, discharged. follow up colonscopy neg.

Yes: Absolutely. Viruses can also cause a regional gastroenteritis with only some symptoms though bloody diarrhea usually makes me think of salmonella or another invasive organism.

Yes it could: The toxins that make you sick from food poisoning target the intestine. So you could definitely just have diarrhea and lower abdominal pain without vomiting.