Another cause of earache is otitis media, an infection of the middle ear. This is most common in children and, again, is usually painful. However, you don't seem to have the characteristic symptoms of either of these. Earache can also be caused by problems with the jaw joint on the side of the pain.
The Initials. Officially, the PT stands for Personal Transportation, but the initials also designate the car's platform. The Neon was based on the Chrysler PL platform, or Platform Low, while the Cruiser was based on the Chrysler PT platform, for Platform Tall..
This is a slight expansion on what DMK says. For established providers, the PTAN is the old PIN, or Provider Identification Number, from Medicare. It takes the form of G12345, or AB12345, or WC1234B (the letters can be different, but those are the various formats).