I had even worse at the ER 5 years ago.
The day after urethrotomy (removal of scar tissue in urethra and bladder neck) I could barely void, had to apply so much pressure it was rediculous.
I went to the ER, they drained it with an intermittent catheter, saw no unusual debris that could block it, so they said "here, drink a whole bottle of water, we need an ultrasound of a full bladder to see whats wrong"......
They had another emergency patient coming in who was in dire need of care, and due to understaffing it took them like 6 hours before they got back to me.
My bladder was heavily distented and overstretched, I was in shock from the pain and even though I would not even have cared if I had flooded the place there I just couldn't, when they took the US the person looked really shocked and said "Oh god...that looks reaaaally full"
When he was done I rushed off to the nearest toilet but again only a few drops per second got out, I got a bilateral inguinal hernia from pusing everything out so hard, just to hear the doctor say "we don't know what"s wrong other than that we call this acute atonic (or toneless) bladder, they prescribed me Myocholine-Glenwood 10 mg which was not covered by insurance and not proven to work either, but after a couple of days I could go again luckily...
But this pain? never again! It felt like every nerve in my bladder was being acupunctured with a microneedle and twisted for evillness :s