Always good to have a vet check this out. If they can't find anything wrong, I would have some bloodwork run to check to make sure that everything is okay, and there aren't any gut infections, etc. Blockages (as mentioned above) would be worth a trip to the ER, as would Bloat/Torsion.
Licking like that can be a sign of nausea. If there is a lot of gastric reflux or acidity, it can also cause discomfort in the throat and esophagus area. The cause of those things would take some diagnostics.
Good luck, hope that the vet finds something easy to fix.