Prevention of post-operative nausea
Until recently there was no good way to prevent vomiting. One could only try to treat it after it started.
Scopolamine (Scope patch)
I have found this technique to be very helpful. Application of firm pressure between the two central wrist tendons and one inch below the hand can significantly improve nausea.
I use this anti-histamine as a last resort in cases of continued vomiting (where the patient cannot even keep a pill down). It can cause some respiratory depression, which in combination with other medications cosmetic patients take after plastic surgery can lead to problems.
What is the best thing to do? Ask your cosmetic plastic surgeon to use a combination of all of the above modalities for the best results. Maybe they know a trick of their own to help you keep things down.