I look at writer's block the same way I look at constipation: I don't give a shit. Hahaha...just kidding.
But really, the thing with being constipated is that you some times have to force it, and sure you often get an ugly nugget of absolutely no value, but you have to keep going. You can't let yourself get overwhelmed by it. Just keep putting out crap until you start putting out stuff you like again. You're a donor, just delete the shitty comics when you're back on track, but write something everyday, even if it sucks. Chances are that you at least think of a funny thing a day, so make a comic out of it. I made some shitty comics today off of something I thought in traffic when a lady tried to beat the light with three cars in front of her (see Filing clerk, VIP-secret power).
I may have made this up or maybe I've heard someone say it and forgot, but it's writer's block, possessive. The writer owns the block, not the other way around. Don't let the block own you.
Also, do what graykane said.
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Peeing sitting down is the gift you give yourself.