Apparently my eye is probably not about to fall out / explode, that's good isn't it?
It seems that the achy / pressure sensation I was having was down to the vitreous fluid pulling the retina, which it is not supposed to do, and the new floaters were caused by this pulling actually pulling off some of the pigment cells. Bit revolting, but not in itself dangerous. There is a slight chance that it could result in another detachment so I have a follow-up appointment in a couple of weeks to check it isn't progressing, plus another reminder to come straight back if the symptoms get worse, but it's not currently worrying. The consultant seemed very very thorough, studying it for what seemed like ages with 2 different lenses, so I'm sure she would have spotted any hint of a detachment or tear. So I can relax now. Although relaxed is not how I felt during the regulation 2 hours hanging around the casualty waiting room roasting to death and wondering if I'd been forgotten. Ah well, over now - at least for a fortnight.