I wonder about your heart rate...
Do you have access to a heart rate monitor you could borrow, if you dont have one of your own?
When people get tested for their max heart rate (so they can find out what the optimum heart rate is to ride at for most energy conservation) they are told by their coaches to ride til they throw up - literally
I know when I am reaching my max heart rate when I am climbing hills and am in the lowest gear, pushing as hard as I can so I go just a bit faster than stopping - thats when I want to throw up...
So maybe you have pushed yourself hard for long enough - and heat can def be part of the equation that raises the heart rate...
Just an idea... good luck with trying to sort out your queasies...



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