Well, everything settled back down to normal by Sunday, so no trip to the GP required. Think I'd impinged the nerve slightly and over Friday/Saturday with lots of rest my spine became much looser and the nerve had the pressure relived. All good.
There was a talk by the CEO today. It turned out to be longer than last year's, and the hotel had bought lots of new chairs for events which were the most uncomfortable and unsupportive I'd ever sat in. After 2 hours, I was in agony. Even people without back trouble were complaining about these chairs. And people do insist on asking questions that are best left to a non-public situation. We got feedback surveys via email and mine went straight back with an overall 'good but do something about the chairs'.
Plus I couldn't read part of the presentation because of my red/black colour blindness - email sent to the communications head about that as well.
People just don't think about disabilities and how a presentation might need to be adjusted - make it available in audio and video, don't use colour combinations contra-indicated for colour blindness, give a short break to allow people to move around, that sort of thing. Nothing major or costly, just small things to make life easier for everybody.
I just know I'm going to be suffering tomorrow...