hi Debra - they actually thought the voluminous amount of sand had more to do with it. The sneezing was a totally dry sneeze - no liquid or what I call 'sniggets' coming out.
I think the shell was just an added aggravation, albeit a much larger (in size) one. Yes, I understand what you mean by causing pressure (I think). I'm thinking of when I get water in my ears and how I stomp my feet or do anything to get my ears feeling 'balanced' again.
It seems the ear flushing did the trick. I have only had a two tiny tiny sneezes from him since I got him home, and I would almost think that was from irritation from the procedure.
I looked at the Foxtail mesh mask that was suggested. Not sure if that would work for us (gut feeling). My sister is very inventive and creative. Perhaps we can come up with something that can work.