In October 2023 I was diagnosed with GCA after 42 days of headaches. I was put on 60 mg of prednisone for a month. The headaches stopped. I also have PMR. We continued with a very slow taper of prednisone until I was able to stop completely in June 2024. My rheumatologist diagnosed GCA initially without a biopsy or ultrasound. My personal thoughts are if you’re still having headaches, you might need to be on a stronger dose of prednisone for awhile.