The vomiting is bad but to be honest I'd expect the rest from LARPing in lots of heat. On seeing how much water we got through I seriously think we would happily have worked with twice as much so may try to bring some along next time.

Certainly if I hadn't gone to lengths to rehydrate myself sufficiently I'd expect weakness, dizziness and possibly paleness. Muscle cramps and tiredness sound like a regulare larp after effect. So yeah. Vomitting is bad but the rest is quite normal. If you can call it normal.. :)