What to do if i feel a bit sick with like back cramps and some symptoms similar to the stomach virus. is this normal?

Norovirus?: Diarrhea, abdominal pain and vomiting typically begin 12 to 48 hours after exposure. Norovirus symptoms last one to three days, and most people recover completely without treatment. However, for some people — especially infants, older adults and people with underlying disease — vomiting and diarrhea can be severely dehydrating and require medical attention. Ref. http://www.mayoclinic.org/diseases-conditions/norovirus/home/ovc-20306336