I had an eye doctor assure me that my discomfort with my new glasses was normal and that I'd just have to get used to it. After several months of nausea and discomfort, I finally went to a new eye doctor that fixed the problem immediately with a different frame and fit. It turned out that the prescription was correct, but the fit was wrong.
Before accepting daily discomfort and nausea as a new norm, you may want to try having more than one eye doctor look at it, if you haven't already, for alternate opinions for tests and on all the parameters of fit. There's alot that goes into getting your vision corrected and a few tiny adjustments off can end up causing persistent nausea and discomfort similar to what you are describing.
Before accepting daily discomfort and nausea as a new norm, you may want to try having more than one eye doctor look at it, if you haven't already, for alternate opinions for tests and on all the parameters of fit. There's alot that goes into getting your vision corrected and a few tiny adjustments off can end up causing persistent nausea and discomfort similar to what you are describing.