Jason, sadly it happens more often than I care to admit. It seems each and every time, all I need to do is walk away as you did..yes it's hard and it also happens to me when tuning calls. I know my ears are totally saturated, but I can't seem to put the call down. However, when I do and return smoe days later the pain I experienced always shows me a bit more light in the tunnel and with determination I usually find it and learn a whole lot in the process.
Then, like you may be describing there are times when nothing looks right and everything I draw first looks like crap, or has no flow or balance. It seems nothing wants to come out when I want it. This is not unusual for most artists experience the very same thing. I can be in the oddist of places and ideas come to me and thus I have learned to keep a pad with me at all times to write or sketch my thoughts.
I could really write a lot about this subject..it's interesting in a disturbing sort of way.

Thanks for bringing this up.
Scott