Wrinkly I'm the same, I'm on mirtazapine for mine and it keeps me level most of the time but I can still have really bad days when I don't want to speak to anyone and can't even get out of bed, can't watch TV or read just stare at the wall for hours on end. Sometimes it is brought on by upsetting circumstances but sometimes it just comes out of nowhere. I usually feel really powerless and there is nothing I can do to shift it, and I end up feeling really guilty because my OH is trying to help.
Hang in there love, it will pass. ((((hugs))))