Nausea after Femara?

Jennie
Took 2.5 mg of femara cd 2-6. Now on cd 7 I have a wicked headache and am so nauseated I've been running to the bathroom thinking I'm going to puke. I'm guessing it's becuase my estrogen is rising again? Has anyone else experienced this? Only symptom while taking it was some minor hot flashes.