Question: what to do when you know your period is coming?
Answer: You're breaking out. Acne is a very common problem at that time of the month. ... 
Your breasts are changing. ... 
You're tired… but you can't sleep. ... 
You have cramps. ... 
You're constipated… or have diarrhea. ... 
You're bloated and gassy. ... 
You have a headache. ... 
You're having mood swings.