"I fired the Rheumatogist, as he refused to prescribe 1mg tablets, and insisted I take 7.5mg, even with the severe symptoms. My new problem is that I've starting to feel weakness in the legs and dizzy. Not sure if this is a PMR problem or Prenisone? Or maybe something else."
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Probably not PMR if those symptoms weren't present at the start of PMR. I hate to say this but be prepared for a plethora of new symptoms after you taper down to less than 7 mg of prednisone. Those symptoms are probably caused by "long term" prednisone use. When you decrease your Prednisone dose too quickly you experience withdrawal symptoms.
https://www.medicalnewstoday.com/articles/322536
Being dizzy all the time was a big problem for me when I tapered off Prednisone. My blood pressure dropped when I stood up too quickly. This problem was compounded by being on 3 blood pressure medications to control my high blood pressure when I was taking higher doses of Prednisone.

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What was your rheumatologist's rationale for not prescribing 1 mg tablets of prednisone? Never mind .. not prescribing 1 mg tablets isn't rational.