Cyclical Depression...

I am not a confident person to start with. I second guess myself in everything I do everyday. So when I am close to my time of the month, not only am I not confident, I am also insanely depressed. I get depressed about my lack of accomplishments, my lack of confidence, and it seems like no matter how hard I try i just can't pull myself out of the muck. it's a pity party of epic proportions. I fake it through the work day, but then I go home and bottom out. I have tried everything I can to pull myself out of it when it happens, but I end up just waiting it out. dose anyone else have this issue? what do you do to help combat it?