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I was definitely very sweaty as soon as I got dressed and it felt like a heat issue but who knows. When I managed to walk out of the pool bit into the lobby (which is much cooler) I definitely felt much much better.
In that particular pool (Dalry in Edinburgh) the cubicles and showers are right by the pool rather than in separate rooms, so same temperature as everything else. I did obviously use the shower before I got in but it was warm. I didn't bother showering after I got out as I was going to go in at home.
As long as the GP clears it I'll try again and investigate to see if there's a cold shower for next time. Seems all the pools in Edinburgh are around 30 (I would have thought the Commie would be "Olympic" temperature) but I guess a pool with separate changing rooms would at least be a bit cooler. Will have to investigate
Thanks for the advice, I appreciate it
frankenbike-
https://www.cdc.gov/niosh/topics/heatstress/heatrelillness.html#syncope
Heat syncope is a fainting (syncope) episode or dizziness that usually occurs with prolonged standing or sudden rising from a sitting or lying position. Factors that may contribute to heat syncope include dehydration and lack of acclimatization.
tl;dr it's being in prone position, then standing, exacerbated by heat.
When you finish swimming, stand for a bit in the pool before getting out. When you get out, sit on the side for a bit. Stand up slowly.
NotThamesWater
30 deg C is warm for a pool, my local council pool is fine for me at 26 deg C.
If you had enough time to get dressed it's unlikely to be any bloody pressure issue related to change of position (e.g. postural or othostatic hypotension) - but there are other forms of hypotension to consider.
Sounds a bit (to my completely untrained medical self) like heatstroke: https://pubmed.ncbi.nlm.nih.gov/23891244/
Sometimes I get out of the pool after a long swim and feel fine but by the time I'm changing I'll be sweating buckets, even though the water temperature is way below body temperature and the air temperature isn't overly warm, but I've never had any dizziness and I've done plenty of 1h+ swims in a fasted state.
Might be worth considering a cool shower after finishing, many pools have showers near the pool side that are cooler than the main showers to get you clean. They're also often in view of the lifeguards.