I'm so sorry for all of you. It is one kind of depression I get from time to time too. It is debilitating. I find that the hardest part is to get into first gear - but once you are up, things get easier. E.g. force yourself to meet a friend for coffee and while you are there, you will be surprised how good it is for you.

If it lasts too long, you need to discuss this with your pdoc, as I'd guess your meds are not being effective enough