Have you had a cold or sinus infection recently? If so, it may be that the Eustachian tubes are swollen or otherwise partially blocked. Running from the ear to the back of the throat, they're about the size of small dimater spaghetti and the hole for thdrainage is even smaller. Most of my pilot cohorts all relate to me a common experience of our wives or significant others making a motion they commnly called the "frog:. Over the years, one learns to jut the lower jaw forward with the mouth slightly open. This clears the eustachian tubes with a noticeable small "snapp' sound. Equalizes thepressure I'm sure.
Our flight attendants are advised to tell parents of small children who are experiencing ear pain (always on descent) to hold the nose shut and swallow (the child, not the parent) rather than the commonly held belief to hold the nose shut an "blow". The tubes drain downwards and attempting to blow the nose forces the blockage up the tube... not a good idea...
This blockage can also have an affect on perceived balance as well.