You know you're fixed gear crazy when...

...when even 1 day without your bike, cos it's being repaired, is 1 day too many.
And now that you're forced to walk, when every time you hear a bike coming, you turn round and are torn between joy at just seeing a bike, and depression cos it's not you that's riding it.

+1
Perfect description. Except I'm that way even when I'm just popping out of the office to get lunch, and it's too short a journey to warrant hopping on my bike.