I experienced ear fullness for almost two years, for me it was entirely related to my neck, although I always had attributed it to my brain and over exertion.

Running or anything that bounces my head around still causes it, but lifting by weights skating riding a bike don't cause me problems any more. It gave me anxiety when it would happen, which of course would proliferate any problems I was having.

Getting ims massage physio stretching helped a ton with mine