Do not be alarmed. There is nothing wrong with your monitor. Hopefully the flickering monitor from hell only exists in this comic. And you probably don’t have PMS either. Except for … well, you know who you are.
Don’t you just love it when a woman is having some problem or other and the some non woman person automatically blames PMS? I wish the monitor from hell had been an artifact of PMS! PMS goes away in a couple of hours.