I had similar issue in my old car, nobody including my wife believed me that car was making whiny sound that wasn't there before, took it to dealer several times and they couldn't replicate it.
Finally put mobile phones on both sides of rear passenger door compartment and drove the car around. Came home and used Audacity to filter, and amplified the whiny part of the frequency to show to others what I was referring to. It was bearing on one side, it developed a whine after hitting curb.
If you do something similar you might be able to capture the "bump" and how often it's occurring to show it to others.
Also is there any chance that it your ears that got very sensitive to motion?