I was first diagnosed with PMR in August, 2023, and I was also worried that I would have or get Giant Cell Arteritis. So I'm right there with you. I even had the biopsy for it due to have 6 out of the 8 of symptoms along with the PMR. My biopsy results showed I was "least likely to have it". After that I never worried again. FACT: Only 10% of people with PMR get Giant Cell Arteritis. Whereas, 50% of people with Giant Cell Arteritis get PMR. So your chances are a lot less than you probably thought. Here are the symptoms of Giant Cell Arteritis according to the Mayo Clinic Website:

Generally, signs and symptoms of giant cell arteritis include:
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Persistent, severe head pain, usually in your temple area - My temple pain was caused by grinding my teeth - TMJ.
Scalp tenderness - Alopecia - Anxiety
Jaw pain when you chew or open your mouth wide - Again grinding my teeth
Fever - PMR
Fatigue - PMR
Unintended weight loss - Did not have
Vision loss or double vision, particularly in people who also have jaw pain - Had double vision - not sleeping and very tired from PMR - was left undiagnosed for 3 1/2 years (my eye doctor did not find anything wrong upon examination)
Sudden, permanent loss of vision in one eye - did not have this symptom.

In a nutshell had 6 out of 8 symptoms and still did not have GCA. If you are still concerned, talk to your Rheumatologist and/or General Practitioner. Many things can cause ear aches from something as simple as needing to clean your ears to sinus infections to ear infections, etc. Good luck and hope you feel better soon. Don't worry, everyone's in the same boat here just trying to figure things out.