I had eaten outside food and also drank unfiltered water due to some problem in our flter on Friday. So yesterday i.e., Saturday, I developed slight fever at 99.4 F, stomach cramps, nausea, diarrhoea, chills, and fast heart rate. I took a tablet of Immodium and a Dolo 650 and slept. Late at night I experienced nausea and significant stomach cramps, so I took Vomistop. In the morning, I again took Dolo since I had slight fever and slept. I feel okay now except the stomach pain and weakness. Is this viral fever? Kindly advise.