Rage?

Hi so I have been on Fluoxetine 10mg for almost 2 months now for PPD. my husband and i have seen a huge difference since starting. I didn't take it for 3 days in a row last week bc I was so so sick (I didn't take cold medicine bc I read that they don't mix well with FLU) I took my meds again starting yesterday and today, but now today i just have so much rage and anger. Even before taking this med I never felt like this. Like I feel like I could scream and punch a wall. I don't like this feeling. At the same time I want to sob. Is it bc I didn't take it for 3 days? I just started my menstrual yesterday Is that why? Should I call my Dr about it or is this normal?