Here is one other thing to consider about the heat. Where were you in your menstraul cycle?
Man... I just hit the wall hard this last week with the midwest humidity. It was suppose to be a short, easy ride... in which I had all the right stuff nutrition /hydration.
Even when not exercising, I do not do well just sitting in the heat. Some other things medically with my body are part of the reasons. Like you, one reason I chose my upocoming century (my first) in the fall. Think that is part of being smart and knowing your body. One reason of many I love Fall... crisp cool air...ahhh.
Only thing that really killed me on my own doctor list is my period and perimeopause. I gain 3-5#s a month. Look 1st tri-mester prego. BUT seem to shed all that in about 1 to 1 1/2 days. I'm a non-stop pee-ing machine.
Going back through my calendar, I was dumping my period water when I bonked. Literally 5 pounds lighter from Wednesday to Sunday morning.
I don't know if my gyno can recommend something or not. I don't want to be being doing this on the day of my century event.
Btw, I agree with your fail title. First, I thought... when you post something like that, you need support, encouragement, etc. Attitudes and perceptions about failure are relative. I see nothing wrong with failing. Just as you say... you learn, grow, etc... the sun comes up tomorrow. So what. You go on... it's a new day. IT'S OK!!!
Good Luck at the doc. Hope you get some answers.
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insidious ungovernable cardboard