Dave
Thanks for that. I do know quite a few people who suffer in the same way as you, so I know that it's far from unusual. I don't know whether mine is the same thing, though, because I normally have NO problem peeing. I can pee at races when there's a huge queue; I can pee in the bushes surrounded by others at the GNR! I can normally pee fine - under pressure or not, cubical or al fresco, people battering down the door to get in or in solitude!
On the 3 occasions where the retention thing has happened to me, I've been away (1st time staying with a family in India, 2nd time travelling into the desert in Oman, 3rd time at in-laws in Newcastle - so it's obviously not the heat!!) and had to wait a while before I could use the loo. Normally, this isn't a problem for me, and I can still pee even if I have to wait (although sometimes takes me a while to 'get going' if I've waited for a long time). But on these 3 occasions, for whatever reason, I haven't been able to.
So, I guess it's possible that it might be something psychological to do with having to wait AND being somewhere where I don't have control (or think I don't have control) over when I go (in India, had to ask where toilet was, and we'd only just arrived at the house and were being subjected to tea and snacks etc. In Oman, travelling in jeep, had to interrupt journey to ask to go to the loo so delayed it as long as possible. At in-laws, someone in bathroom for an hour).
But I'd be interested to find out what the neurological thing might be...
I tried desperately to 'relax' and 'forget about it' yesterday morning, but it just didn't work. There was no way it was going to happen and I was in such agony, it was off to the A&E dept for me!
The nurse suggested a warm bath and trying to pee in the bath (yuck!) if it happens again. Problem is, it seems to happen where I don't even have control over the toilet availability, let alone peeing in someone else's bath!!