Strong (opiate) pain meds commonly cause nausea. If that's the cause, the best way to get rid of the nausea is to reduce or eliminate the opiates. Perhaps you can try putting up with more discomfort?
I'll strongly second that. I was switched from opiates to oral Tylenol (paracetamol) four days post op. As long as you can keep it down it should be tolerable.
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