This is pretty much the worst. When I had my botched eye surgery, I was in constant, crushing pain (in my eye) and this weird nausea where if I so much as drank water (and some times, even when I didn't) I would vomit profusely. You know what's worse than vomiting when you have nothing to throw up? Vomiting with eye surgery.
Evidently, the stuff they used, Versed, didn't work well with me (I was completely cognizant during the actual surgery). I don't wish that on anyone.
What I did learn with my various stomach flus, since I was in and out of hospitals and you pick them up quickly, is drinking lots of gatorade helps a lot. Sleeping too.
Hope you feel better.