What's the best way to treat nausea?

I had a fever (I’m much better now, thank God), and I’ve been suffering nausea. Is it from how much I’ve been coughing and how hot I was? I got the nausea within the fever, and I still have it slightly now. I thought that it was my computer causing it at first, but I noticed that I get the nauseous feeling whenever I sit down. It’s a slight pain in my stomach’s center. Any tips?