Get hold of this. It’s pretty much the best book understanding depression and it’s affect on your head. The illustrations are brillant as are the one line simple explanations of what goes on when black dog comes to visit:

“When the rest of the world seemed to be enjoying life, I could only see it through the black dog” (illustration of someone with sunglasses shaped like black dogs.)

“Activities that used to bring me pleasure suddenly ceased to.”

“He liked to wake me up with very repetitive, negative thinking.”

The authors story is here.