PCOS and Birth control

My doctor told me last month that I have symptoms of PCOS. To regulate my cycle he has me on birth control for 2-3 months and will start Femara right after. It’s been about 3 weeks with taking birth control and I’ve felt nauseous, weak, and throwing up everything that I eat it’s been miserable and just yesterday I’ve felt feeling of depression and full of anxiety. Has anyone felt this way? Is this normal?