psychosymantics hello!
You know, I went through this more than once. I just wanted to share in case its not SAD.
For me it was part of my anxiety disorder. I literally was too afraid to do anything. Start anything, finish anything, was just not motivated to do anything at all.
Just another view..maybe anxiety has contributed to the depression??

Welcome and keep us posted!
__________________
The sign of intelligent people is their ability to control emotions
by the application of reason.
-- Marya Mannes (1904-1990) American Journalist