Delayed exhaustion after exertion or stress?

Hi,

Does anyone else experience delayed exhaustion of about 2 days after exertion (e.g. physical exercise) or high stress? 

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Over the last decade I've noticed I have a delay that's around 2 days. On the day and the day after the exertion/stress, I feel fine. But the second day I am totally exhausted. 

The timing varies a little - it's not always 2 days.

For me, the exhaustion is all-encompassing and I feel very ill with nausea, air hunger, body aches and pains, and it has led to melt downs and shut downs when at its most intense. The whole day is usually written off.

It's making judging appropriate levels of exercise and activities difficult with the feedback being so late. I may continue to do more things on the same day or day after without realising I have delayed repercussions on the way. I've tried resting extra, just in case, but the delayed reaction still happens.

Medical professionals haven't been able to help so far. But all medical tests have happened to be on days when I'm not experiencing this issue and I'm feeling fine. Even tried to force it to happen for some tests, but I failed!

Does this sound familiar to anyone? Any clues?