Downward spiral of depression?

A colleague in the National Writers Union asks if others, like her, suffer periods of tremendous doubt of their writing and enter a downward spiral of paralyzing depression. But she wasn't just looking for company for her misery; she wanted solutions. This is what I told her:

Yep. I'll bet we all do, sometimes. What I do about it is dose myself with virtual Prozac ©. In my case this comes in the form of a shelf of poetry. Howard Nemerov is very good for this ailment, at least in my case. And Antonio Machado helps me remember that you just have to keep going on. (That's what Samuel Beckett said, too.)