Our expert says:
I actually don't think the two are linked. At least, let me clarify that to say that I don't know of any other situation where such light exercise would cause those symptoms. Yes, if you exert yourself hugely then it is possible to develop symptoms as though sick - this happens to marathon runners, for example. That happens because the high rates of air flow irritate our air passages, they become inflamed and we feel sick.
So that was my thinking until you mentioned your latest bout where you just walked up the steps - that suggests that maybe the second occurrence was either a co-incidence, or there is something else there, not related to training.
So I've never heard of this before, I am therefore grabbing at straws, but I'd say you might try again and see what happens if you exercise in a controlled environment, preferably outdoors, and really take it easy. You might try to supplement, but really, there's no single supplement that jumps out as being a 'magic bullet' - glutamine and zinc are two that have gotten some attention recently, so you can try them, but they come with no guarantees!
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