Does peppermint oil help with post-op nausea?

I canceled my date for a proximal RNY and am now scheduled for a BPD/DS on the thirtieth of this month (thanks to all who responded to my earlier question). I had non-WLS abdominal surgery a year ago, and was sickened by every smell for more than a week afterward. Somewhere, I read that sniffing peppermint oil from a handkerchief helps many people with this problem. Does anyone know where to find peppermint oil? I have not found it in any grocery store, nor at the local GNC (I'm in the Washington, D.C. area). Has anyone found anything else that is effective against post-op nausea? Thanks.

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