Is PMS a Myth?

I don't agree with this research at all.  I know for a fact I am meaner, fall asleep on the floor tired and I inhale everything I can find in the house to eat for about a week before I actually get "it". And when I say mean I really mean pissed at everyone all the time for no reason, on top of Fibro pain..watch out!!! I am not pleasant to be around. But I do agree with the part that says when you use PMS as an excuse people might not take your feeling seriously, but in my case that's okay because I may end up divorced if my husband took my feelings during that week seriously!!!

Is PMS a Myth?