I'm having the same problem, only instead of feeling low, I am feeling such rage and anger at almost everyone. After teaching elementary students all day, I feel so bad for my own children because I have zero patience for them when I get home. And my husband? I want to divorce him at the same time every month. It's getting worse each month and takes me a little bit longer each month to recover. I feel like I'm getting to the point of just being angry or sad all the time. I've read that hormone levels could be a huge factor. I'm hoping to just keep my head down and mouth shut until I can get to my doctor and have my levels checked or something.