As a certified speech-language pathologist, I agree with runnergirl. Get a modified barium swallow which can detect problems in the mouth, and upper esophagus for liquid and solid food swallows.
Also, do a websearch on the term "globus hystericus" and "hypopharyngeal syndrome" and see if the symptoms fit your complaints. These types of disorders are often seen in younger people who may complain of difficulty swallowing with no medical reason for swallowing difficulty.
Good luck to you,