I agree with Metz ... that is impressive. Prednisone withdrawal symptoms are caused by "insufficient cortisol."

It just occurred to me that insufficient cortisol describes the problem better than "adrenal insufficiency." An actual problem with the adrenal glands doesn't happen very often.

"To help prevent prednisone withdrawal, a person can take the following precautions while using prednisone and during the taper period afterward:
1) stick to the recommended dosage and not take more than the doctor prescribes
2) taper the dose according to the doctor’s instructions
3) avoid suddenly stopping prednisone treatment

When a person first starts decreasing the amount of prednisone, they may experience aching or tiredness. This is common. However, they should contact a doctor if these symptoms do not resolve over 7 days."
https://www.medicalnewstoday.com/articles/322536
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Maybe if more people followed the above guidelines, they would have the success that you are having.