I have GCA and PMR , YOUR SYMPTOMS are right on the diagnosis for both. Eye specialists are an important part of your treatment. Rheumatologist treats GCA because it’s autoimmune SO IS PMR. ON MY 4th month of IV Actemra.I didn’t not feel great , just a small improvement. I have head aches daily also. I call my “ hit the in the head with a hammer headache”😣 sympathize with you. It’s like an endless Roller Coaster , Dr. try to help but it’s so complicated. Wish you well