Dehydrated, or maybe some mineral/vitamin defficiencies? Try to up a bit your magnesium intake (bananas would be cheapest I think, but wild fruits like berries and so on are good also), and calcium intake (milk and milk derivated food).
In addition to making sure you're properly hydrated, it's also possible that your heart rate is way too high, and you haven't spent enough time cooling down. Walk around, stretch, move around for a while. Don't just sit in one place.
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