Could I give my son tylenol if he has a stomach virus?

My son has a stomach virus and he is 9 years old and I gave him tylenol and he said that he feels worse. I gave him water and gingerale. He does not want to eat anything because I know that taking medication on an empty stomach is a bad idea. So what should I do, regarding what I should give him? I tried to give him the pepto bismo tablets but that is not working.