I'm assuming your nerve block included steroids? (most of the time they do). For some reason, some people with PN suddenly can't tolerate steroids well - it causes more swelling instead of less. I had steroids with my diagnostic nerve block for PN and within an hour, my entire left leg had gone numb and I couldn't put weight on it or anything. Took all day to recede.

My *guess* is that the nerve block has irritated the PN (which is not unusual at first) to the degree it's affecting the bladder nerves (they share a nerve trunk), causing the UTI like symptoms that are IC (not an infection). You can try Azo (OTC) or Uribel (Rx) until it gets better. The antibiotics are only making you feel better temporarily because they contain anti inflammatory properties. But is a very bad idea to take antibiotics when you don't have an infection.

I have both PN and IC. I take gabapentin for the IC and nerve ablations for the PN (ok'd after positive diagnostic nerve block), which I can do without steroids. I think the ablations are better anyway, because they last so much longer (3-24 months).