Welcome @sheri2337, I have had two occurrences of PMR but both were treated with a starting dosage of 20mg prednisone. I've read that high doses of prednisone can cause symptoms similar to what you describe.

"Symptoms of Cushing's syndrome may include: weight gain in the face, abdomen and chest; wasting of the limbs; a fatty hump between the shoulders ..." -- Hormones – cortisol and corticosteroids: https://www.betterhealth.vic.gov.au/health/conditionsandtreatments/Hormones-cortisol-and-corticosteroids

Exogenous Cushing's syndrome secondary to intermittent high dose oral prednisone for presumed asthma exacerbations in the setting of multiple emergency department visits: https://www.sciencedirect.com/science/article/pii/S2214624517300059

Do you mind sharing a little more about your symptoms of PMR with GCA?