re: having to pee - I agree that it is the thickening of the blood that makes you have to pee. But my experience is this happens when your body notices the temperature difference. (Why else do you need to focus your blood in your core?) On that same trip, I dove in Guatemala in a lake wearing an 8mm farmer john and didn't have to pee at all. In my recent trip to the Yucatan, diving in the warm ocean with a 2mm shortie, there was an urge to pee. Diving in the much colder cenotes with a thick wetsuit and hood, no urge to pee.
re: cold and fatigue - I don't think it was mild hypothermia. Sub-clinical DCS is a possibility. I do think temperature or perhaps amount of fluid in the blood affects the off-gassing. But it's beyond my grasp of the science.
re: cold and fatigue - I don't think it was mild hypothermia. Sub-clinical DCS is a possibility. I do think temperature or perhaps amount of fluid in the blood affects the off-gassing. But it's beyond my grasp of the science.