Letrozole 2.5 symptoms HELP

This is my first round. When my Dr. Perscribed it she said it was a very low dosage and I shouldn't have any symptoms. I started it yesterday and today I feel nauseous and I have been in the bathroom. I have my sisters wedding this weekend?

I really dont want to have to stop taking it. Any thoughts? Anybody else in this boat and did something that helped with symptoms..