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If you had flu and are recovering from it, then in all probability nausea is due to acidity following fever. This can also cause a cough that can make a person gag to the point of throwing up. Alternatively it could be lung infection or bronchitis. An X-ray of chest should be done.
It could also be that you had stomach flu too though that did not result in diarrhea, only nausea.Persistent nausea can also be due to liver infection which can be diagnosed by a liver function test.
You need a comprehensive investigation taking all these points in consideration. It is difficult to comment beyond this without examining. Please discuss this with your doctor and get yourself investigated accordingly. Hope this helps. Take care!
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