PMR long lasting headaches

The first thing is to check it out with your doctor.
Do you drink plenty of water?

I had headaches at the onset of my PMR last January. They were odd; if I stood up too fast I would get acute pain at the back of my head. I would grab my neck until it faded. It lasted about 4-6 weeks, and I no longer have these, thank goodness.

October 2023 I had 42 days of headaches. Very unusual for me I was finally referred to a rheumatologist. I was diagnosed with GCA giant cell arthritis which is inflammation of the blood vessels in the head. This is a very serious condition and requires immediate medical attention. I was immediately prescribed 40 mg of prednisone to bring down the inflammation in my head. I also was experiencing polymyalgia, the rheumatologist told me that both conditions go hand in hand.
Untreated, giant cell arteritis can cause blindness, aneurysm, or stroke. Please seek medical attention. I am completely off of prednisone now as of June this year. The headaches went away very quickly after I started prednisone therapy. I remained on the prednisone for eight months because of the polymyalgia.