Ari,
I get into states like you seem to be in. I have to wonder whether your issues might be more generally existential, but expressed through your relationship to photography. Mine are. When it happens - and it frequently does - I need some way to put it into some sort of larger perspective that takes it away from the personal. When it is focused on the personal, I just feel bad about myself, which is just self pity. No fun, and it's unproductive.
One thing I've found helpful, even though I ain't exactly what you would call "religious" in any conventional sense, is to read Ecclesiastes. It's a hoot. He's even more cynical than I am, and manages to take existential angst 'way up into the universal human experience. For me, it makes my personal stuff funny. He rails about the ubiquitous presence of vanity. That has amazing application in looking at the world of photography, which is a great reservoir of vanity (if not narcissism).
And, there are fun things like "He who pisseth against the wall".
Actually, I don't know how it ever got into the canon. It never seems to me there is anything religious in it at all. I think it must have been written about photography. I've been thinking it might be time to read it again.