I had the same thing happen, and I was diagnosed with Meniere's. This initially occurred for the first time in my 30's I am now in my 70's. I spoke of it to my son's allergist, and he did testing on me that revealed I cannot have (basically) seed oils or MSG/salt. I believe it is both an allergic reaction and a matter of an increase or balance of fluid in my ear. I also have congenital hearing issues.