Very interesting and very important topic. First of all, are you using any kind of headphones? If so, stop using headphones and rely on monitors.
Second, stop working for very long time. Take breaks.
Third, Have you tried some excersices such as opening your jaw as wide as possible, moving your jaws in circular movement and trying as much as possible to open the ear/nose canal.
Fourth, you really need to visit your doctor NOW! and ask for the "ear pressure" test.
This is very important.