Sorry to hear that you´re feeling so nauseus. Unfortunally I´va had the same experience but for me it didn´t start untill I had taken it for severel years. I agree with the others, try mtxinjections. In my case it made no difference if I took it as a tablett or as an injection but it´s worth a try. The nausea was so horrible that even today, severel years after I stoped having MTX i can hardly speak of MTX without feeling the nausea come back, like with pavlovs dogs you know .
Hope you find a medication that works för you.