I experienced a lot of nausea during my first month on and off as well. I just finished my 3rd pack today and during my period the similar nausea feeling occurs right before I get my period and remains during the first or two days. However, I never got to the point where I threw up. I have been on two brands of birth control before and I had such bad side effects during my first month that I stopped taking the pills just after 2 weeks. I think most doctors prefer that you stick through the first month but I think your side effects are a little extreme and you may want to consider doing research on different brands of birth control and choosing 3-4 different brands you would want to try and ask your doctor which one he/she thinks would be best out of those 3-4. Certain birth control pills are more prone to certain side effects (weight gain, nausea, depression) so whatever you're having trouble with, choose a brand that isn't so susceptible to that, there is a lot of information online regarding this.