Actually, I have had a similar problem caused by a bad saddle. I got so inflamed down there that my urinary tract was constricted for a few hours and I could only get it going when my bladder got so full that it finally overcame the resistance. If you also have crotchal numbness and burning/tingling, then you could be having some nerve compression caused by saddle ergonomics.

I now use a saddle with a cutout and life is better.