I agree with margy; if this has only been going on the last couple of days, as you said, then he may have a stomach bug. My family just got over a stomach bug and although in general, it makes you feel very sick as well as nauseous, sometimes it just makes you nauseous. I was fortunate to just get the nausea and didn't vomit, but my husband and two sons were vomiting up everything they ate for about a day and a half. In my case, I just felt queasy and didn't want to eat...