Jackie, the nausea may well be caused by Mirena. There's lots of women out here that have had the same, and it doesn't have to happen immediately. Some suddenly get it after a few years. The Mirena causes hormonal imbalance and this may happen gradually over time. If you are sure you are not pregnant, then the Mirena is the most likely cause.
I had nausea the entire time that I had the Mirena. One week post-removal, the nausea was gone. Good luck to you.
My advice is to get it removed now before it's too late, you may start seeing other symptoms soon.
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