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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-
GP said tiredness, dehydration, hunger and heat are all contributing factors to fainting, all of which I had to some degree. So yeah, nothing to worry about thankfully 🙂
Back back ~3 times since then and I was fine, although it is still clammy as fuck once you get out
Only managed 900m in 30 minutes
Lol, I've been doing 400-500m in 40 minutes and I need a rest after each (25yd) length of front crawl so sounds pretty fast to me. Hopefully I've got some comical gains for the taking because my baseline fitness is so low.
frankenbike
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