Do not sit on this - tell your physician immediately as the jaw pain when chewing, earache, headache and vision problems are classic symptoms of Giant Cell Arteritis, the companion disorder to PMR. I have it and my mother-in-law had it. Lack of proper treatment can result in blindness or stroke. My doctor told me to get to an ER immediately if I had vision problems. You will most likely need a biopsy of your temporal artery, but treatment, usually a higher dosage of prednisone or other drug, may be started prior to the definitive diagnosis. All the best.