What causes diarrhea, recurrent fever and bloating?
a parasite probably
it sounds like a parasite infection. Some parasites may cause intestinal inflammation and malabsorption (which causes his inability to digest fatty food and worsens the diarrhea). Most of them won't get over unless treated with appropriate antibiotics. Your husband should do a stool test for ova and parasites which is essentially a microscopic examination of the stool. The treatment depends on the detected parasite...
I've not considered the viral scenario because three weeks is a very long time for most viral diarrheal diseases. The infectious etiology is the most likely - I agree with your husband on that - because you've got it too and because you haven't mentioned any other factors like recent antibiotic exposure, pancreatic disease, etc.
You'd better avoid using drugs like advil particularly if you loose too much fluid in the diarrhea because it may cause renal damage among other side effects. Using advil may also mask the fever, so perhaps the "on and off" fever might be the result of this drug.
If I had to pick one diagnosis that would have been Giardia lamblia infection, although I can't do that without clinical examination data and appropriate testing.
I hope you find my comments helpful!
You can contact me again, if you'd like any clarification or further information.
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