Re ciguatera which I contracted way back in about 1966, no memory of diarrhoea but was very sick for about six months and the main symptom( and the one by which it was diagnosed) was the hot and cold reversal syndrome. Very weird. I ate only the recommended variety of fish on a trip to swains reef, but I think didn’t follow the rule later employed of eating only a small portion from each fish and definitely nothing from any fish over five kilo. I couldn’t eat any fish for twelve months afterwards as I would break out in hives and the area around my mouth and lips would swell up and tingle for a long time. Went back to swains a couple years later, followed the rule of eating only small portions from multiple fish and avoided the blacklisted varieties and I was fine.