Could Severe Pain Along With Abdominal Cramps Be Due To Viral Infection?

I havebeen II llfor 3 days now. It started with just a remedial fever and I was able to calm it with tylenol. I have stayed in liquid diet to flush this bug out. I had some old amoxicillin so I started a coarse. I know that is a no no but I figured if it sbacterial gget it.. or vvirul it won thurt. Now Iit has progressed to stomach cramps that are very painful. . That go away when I can defacate.. díareal.