30 yo fit and healthy, male. Oil and gas rig worker in the cooper basin (ambient temp approx. 35 + humidity). Felt thirst and lethargic post manual labour in the sun on Thursday. Has since consumed fluids, however feels lethargic ++, and has no desire to eat. Pt usually consumes decent amount of food. Very unusual for Pt. Occasional waves of 2-3/10 abdo discomfort. Nil diarrhoea. Single vomit on Friday. Nil haematuria or malaena. Dull postural headache on Friday (1/10). Slight general body muscle aches. Nil cough. Nil CP. BP 105/60 (potentially normal for pt - slender, fit). Pulse 60, srr. ECG Sinus. Temp 36.6. Is this heat stress not resolving? A bug of some variety or.....??????????? Thank you for your time. Regards, Margot :0)