My ear blocks while projecting my voice to an audience.

Most of my work involves public speaking. Recently a situation has developed where my left ear blocks up when projecting my voice to an audience

< this only happens when I am speaking to an audience

< the problem can begin after an hour of public speaking;

sometimes it can kick in a little later; occasionally it does not happen at all

< when it starts, it keeps coming back during public speaking time

< when I stop speaking loudly it goes away

< it is not painful, just annoying as it muffles the sound of my voice

< only very occasionally I have had this problem in the past but now it is more frequent. I am 63 years old

< I have had my ears rinsed by a doctor removing wax blockages but it hasn't resolved the problem

< I am trying to figure out what triggers it: swallowing, for example, I drink about half a litre of water (sometimes more) over a four hour public speaking session

< has it something to do with the way I use my voice?

Many thanks.

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