HI, @sbtheplumber, best to seek medical help immediately. If you experience any visual disturbance, go to an Emergency Room. GCA can cause loss of vision and blindness. It needs to be treated quickly.
I had PMR for a number of months, then GCA and relapsed once so far. I had short stabbing pains in my face, from my nose to my ear, scalp tenderness, a dry cough, loss of appetite, fatigue, an itchy torso, and visual disturbance, three times. I could only see white out of my right eye. Fortunately, I didn't lose any vision.
Are you currently taking anything for PMR? GCA requires a pretty high dose of prednisone - 40 - 60 mg daily, depending on the person's size, I think.
Anyway, immediate access to appropriate medical treatment is critical for GCA.