What an interesting symptom and one that is apparently not that uncommon. You might want to check out this long thread started someone with a similar symptom and see if anything rings a bell. One person suggested hugging yourself tight up toward your chest and inhaling again and seeing if that relieves the spasm. You should also make sure that you are taking plenty of fluids with electrolytes as low electrolyte levels can increase your risk of having muscle cramps.
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