A few days ago I was with a couple of friends when a particular piece of equipment started beeping in the room we were occupying. Well, I was told it was beeping but I couldn't hear it
The beeping continued intermittently for a few minutes but it was the same each time: I only heard the sound of silence....
Even when I thrust my ear right up to the the source - nowt 
This concerned me so I paid a visit to an optician who did a very brief hearing test to establish if a further test is required and yes, it seems I did miss a few of the sounds in the test. I barely heard a lot of them but could just make them out; they seemed to be very high pitched.
I'm not entirely sure what I'm asking here. Perhaps, can anyone tell me if this has happened to them and if this is the beginning of the end??? Will it get worse?? Where do I purchase an ear trumpet??
Thank you 