Depressed

Thakali
So I don't really post on here but I need advice because I'm not sure if this normal or I should go to my doctor about it. I get very depressed about a week after my period, deeply depressed. Sometimes it's hard to even get out of bed because I just don't feel like anyone would even care if I was there, I over think things, and I get very emotional.. 
I've been fighting depression for a long time; none of my family knows about. I'm not really sure how to about this..... So I need advice 😞