Any new sensation in your gums (which normally render no "feeling" at all) should be taken as a reason to examine the gums more closely. In the absence of a nerve problem, I would suspect that you may have swelling and inflammation from an infection. It's time for you to see a dentist and have this diagnosed and, if necessary, treated. Gum infections usually give no warning, but can drastically reduce the bone support for your teeth. Check out this link for more information.
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