Period related depression.

I've suffered from two bad bouts of depression in my life. I've been pretty steady the last 6-8 years but recently (for the past year) I've started to feel really low again. I've noticed that my lowest points seem to coincide with the coming of my period. I feel so low that I think about hurting myself, I feel so disconnected from everything...but then a couple of days later I feel a bit more normal. It's so confusing.

Does anyone else feel like this?