Pain when chewing, popping when opening wide, and pressure and pain/fullness in ears?

Pressure: Partial blockage of the eustacian tube which runs from the side of the back of the throat into the middle ear. When this happens it creates a sensation of fullness. You can try relieving this by thrusting your lower jay forward and your head back, or by holding your nostrils and blowing against a closed mouth (but be very careful with this), or use a nasal spray or decongestant or a sinus rinse.