So sorry for your experience. From what I have read it appears that GCA is so often misdiagnosed/undiagnosed
for a long time in many people. For that, I feel lucky that I was diagnosed within a month with my only symptom being minor headaches in the evenings and overnight for a month. My allergist had the wisdom to send me for a blood test and the SED rate and CRP were both high. That started me on the quick road to the ultrasound and biopsy and ultimately the diagnosis. Glad you are feeling better. Good luck with the rest of your treatment.