I agree with the above posters... sounds like it *could* be that you're not eating enough before/after a workout and your blood sugar could be dropping too low. Are you eating too few calories for your body? Your body gets unhappy when you do that and it can result in anything from a headache to fatigue to who-knows-what.
Also, what kind of exercising are you doing? If you're lifting weights (and heavy!), then I've read about some people becoming ill during/after that. I've also read about runners getting sick if they're running a longer distance or faster than usual, but I have pretty much no experience in that department so I can't help you there. Personally, I get heartburn, either from lifting or the protein shake afterwards (not sure which since they go hand in hand! Haha), so I take a couple of tums to try and prevent that.
How long had it been between your morning snack and your workout? If it had been a while so that your tummy was relatively empty, then maybe eat a larger morning snack or eat it closer to workout time, perhaps with some whole grains and protein, so that it will stick with you longer.
And, when in doubt, go and see your doc! There could be some underlying health problem here. It's always better safe than sorry.
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