Is There Such A Thing As Crystals Forming In The

Is there such a thing as crystals forming in the Eustachian tubes that gives on the sense of a plugged ear? Had a recent check of my ears at ab ENT, Said ears are clear, Hearing test not much change just age related. Have been using alleruy pills and Nasonex . Blowing and popping my ears. Right side always feels like it is plugged. He says it is allergy related and sinus. This has been going on for several months.