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I've had similar episodes in my 50s, though maybe not as severe. And batteries of tests never found anything. Partly, I think, it WAS that I was undertrained. Maybe that isn't the case for the OP.
If you've had the fulll battery of tests and the docs find nothing, try not to overhting it or worry about it too much. First take a break and reset, and then come back to it gradually. Do a ton of base miles before you ride hard. And when you ride hard, also do a ton of base miles.
Good luck