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"Serious" is not the word I would use, dont worry. Your teeth are probably tender from the excessive grinding. This is referred to as Trauma from occlusion.
They should return to normal after a day or to. To help speed this up, please take anti inflammatory medication. Switch between taking 400 milligrams of ibuprofen (e.g., 2 tablets of Advil), and 1000 milligrams of acetaminophen (e.g., 2 tablets of extra-strength Tylenol) every 3 hours. Be careful not to use these medications if you have had previous adverse reactions to either, or if you have had gastritis or peptic ulcer disease in the past, or if you have liver disease.
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Good Luck !