I've had pressure/fullness in my left ear for about 2 days now. It moves from behind it to on top towards the temple and to my jaw? Cause?

Eustacian tube . You may have an issue with your eustacian tubes not equalizing pressure in your ears. This will cause a build up of pressure that can be painful. At times this will pull fluid into the middle ear which has the potential to become infected. This can be triggered by allergies or an infection that causes nasal passages to swell. There are over the counter treatments but need provider to confirm dx.