Connie, you are definitely not alone. This is a good board and it helps a lot to vent or to try and help someone else. I think it would be a good idea to consult a psychiatrist about your meds. They often stop working, but it may be that one that didn't work in the past may work now. I am back on prozac, which I took many years ago, but it is helping me more now.
Boy, I totally identify with you about not being able to do the smallest thing when you're depressed. Sometimes I cannot summon the energy to take a shower. I'm recently retired and I thought my house would now be spotless and perfectly organized; guess what, it is still as cluttered and dusty as before I retired! Do what you can, even if it's the tiniest thing. Write it down so you remember you are competent.
I have S.A.D. as well, and it's getting to the time of year when it is the worst. The holidays are really hard because you feel like you're supposed to be as happy as everyone else (like they show on all the Christmas commercials). This time of year is very hard for depressed people. You are absolutely not alone with that. Some people take medication only during that time of year. I have heard about lightboxes that are supposed to help but the reviews are mixed. I have not tried one.
I hope this helps even a little. Hang in there!
Deb