I'm not familiar with the issue your describing except for very brief times that I get altered hearing in one ear, it sounds like a bubble is in it.
I did a little research though and found the following:/en.m.wikipedia.org/wiki/Patulous_Eustachian_tube/en.m.wikipedia.org/wiki/Ear
See if this is similar to what you describe? Make sure to follow-up with a doctor.
Best of health to you.