I am so sorry about the appointment with the rheumatologist being cancelled.
It's harder to be seen by a specialist quickly since Covid. I'm so glad she didnt have polymyalgia rheumatica. That's a hard disease. Have you searched under Google Scholar? There are boo coos of medical information that may shed some light on this. I'm so sorry you are battling cancer and also caregiver for your step-son. You have a heavy load. Praying fiercely for you & yours.