The onset can be quite sudden.
The causes seems to be unknown.
It may or may not be due to hours of headset flying, noise, gunshots etc.
It does not seem to have any medical significance.
It goes away and comes back.
There might be a certain degree of stress associated recurrence.
Sitting on the sea shore listening to the waves is unlikely to help it. Neither is firing shotguns indoors.
Get a check out with a decent ENT chap.
How would the AME know about it anyway unless you told him?
AFAIK it is not a disclosure item.
Hardly think it would affect a Class 1 -especially if you havea note from an ENT chap to say that all is well.
I am not a medical person. This brief is based on private experiences of a non voluptuous nature.
Of course-you may be about to enter The Twilight Zone.........
YouTube - The Twilight Zone: Nightmare At 20,000 Feet 1