Admit it. Estrogen and progesterone don't work well together on PMS and period. They make your thought scattered, one topic to another. You can't arrange them into a hierarchical priority topics. What happen is that the bad topic is always being put on the top. For no reason, you NEVER KNOW WHY.
It's gonna be a good idea: let's take notes on every "hot topic" that arises each month, and analyze the pattern :D For example, how many percent is the "love" topic, "family" topic, and so on. I have an assumption that the topic which becomes the top priority while we're having period is actually the hidden anxiety in our subconsciousness.
Why hidden anxiety should be taken into account? Dunno :) I just think it's interesting!