I'm on my third round of femara, and had no side effects
the first month, but the second and third cycle, I did have a headache on and off for a couple of days. No tummy aches or breaking out, though. BUT, since you took such a high dose all at once, it wouldn't surprise me if the stimulation of the ovaries is causing some crampiness. Like dnikki said, you could always call your doctor and check. Best of luck!