This could be esophageal spams or reflux or gas pain. Any time swallowing is an issue it should be checked just in case of the rare but serious possibility of esophageal cancer.
You can read more about the symptoms of reflux here:
http://www.healthcentral.com/acid-reflux/introduction-000085_4-145.html?ic=4004
You can read more about the symptoms of esophageal spasms here:
http://www.healthcentral.com/encyclopedia/408/374.html
Best of Luck - Stephanie
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