Suggest Treatment For Gas, Bloating, Nausea, Diarrhea And Chills

My husband woke up this morning starting with gas, bloating, nausea. It progressed from around 9:30am to 11:30am to stomach cramping accompanied by diarreaha and chills and legs aching. Shivering at first, after 3 blankets a heating pad under his legs and some alka seltzer for colds the chills are subsiding and the aching legs are feeling better. I know a Gastrointestinal virus has been going around. Could this be the cause?