I know, from first hand experience, what it is like getting a diagnosis of GCA. Please try to relax and start taking Prednisone. As time goes on, if you are able, your rheumatologist might off you Actemra and other meds. I suggest that you try them and you might be fortunate that they will work. The treatments are definitely better than losing your eyesight, etc. My best to you.

@marieameehan, my mother-in-law was diagnosed with GCA in her late 80s and lived to be nearly 100. I've had it twice so far. If you have a good physician and follow instructions, you'll be fine. For most people, it eventually burns out.