I Have Been Extremely Nauseous For The Last 2 Days.

I have been extremely nauseous for the last 2 days. I have no fever, aches, or other cold/flu symptoms. I threw up yesterday morning, but have not since then. I think it may be food poisoning as I ate some leftovers that were older than I originally thought, however, I have had regular bowel movements (no diarrhea).

Is there anything else it could be? Is there anything I can take to stop the nausea?