I'm pretty sure most of my problem too is PMMD. I started back on meds a month ago after being off for 2 years. It seems when I'm on my period my mood is better and then I notice a gradual decline when it's over, the worst 2 weeks before. Last weekend I just wanted to sleep and do nothing, and I felt life I was in a horrid pit of such darkness. I hope when the meds kick in it will get better. I hope you feel better too.