Hi @dmoonchild, the chapter on Giant Cell Arteritis and Polymyalgia Rheumatica in Cecil and Goldman's Textbook of Medicine has a diagnostic algorithm for PMR, CRP (c-reactive protein); GCA. If elderly patient presents with symptoms, after exclusion of alternative explanations (Malignancy, infection, connective tissue disorder) , check for elevated sedimentation rate/CRP. If no, it advises "consider diagnostic trial of corticosteroids, prednisone 15 - 20 mg. " Can you ask your doctor to do this or find a physician who will? Have you been seen by a rheumatologist? In addition to headache, do you have a tender scalp, trouble with your jaw when eating, vision problems, fatigue, lack of appetite? Those could be symptoms of Giant Cell Arteritis. I had symptoms of PMR and GCA for a year before my inflammation markers were elevated. Luckily, I had a physician friend who listened to my symptoms, checked my test results and encouraged me to pressure my PCP for the proper tests. Sometimes we just have to keep advocating for ourselves. It's difficult and often discouraging. Don't lose hope.