Prednisone, Leflunomide, adrenal adenoma. Confused

I was diagnosed with PMR the end of October. Originally put on 15 mg of prednisone. Helped but not great. So upped me to 20 mg for 2 weeks and told to taper 2.5 mg every 2 weeks. 10 mg was ok but pain increased a tad but not debilitating. Nervous to taper to 7.5 so called my rheumy. She suggested Leflunomide. I don’t want to go down that road due to side effects. I then tried taking 5 mg at 3:30 am someone on discussion suggested and 2.5 in the morning after breakfast. It’s ok but have some discomfort (maybe a 4 on a scale of 10). Should I be concerned that I have some stiffness and pain but can still function?
To complicate matters I have an adrenal adenoma, which normally should not be of concern so trying to get an appointment with an endocrinologist. I feel like I’m stuck in a catch 22. They won’t see me until I’m off prednisone for 1 month although today, which much insisting, I was able to get an appointment in May. Can they (prednisone and my adrenal gland) all be connected? Anyone else been through this?