Mad amounts of coffee, not because of the caffeine but because I'm lactose intolerant and I can nap on the toilet 😂
But seriously have you tried to get your hands on some recreational oxygen. Seems to help alot, couple puffs when feeling really fatigued.
Something similar to this. https://www.amazon.co.uk/Oxygen-Plus-99-5-Pure-Recreational/dp/B076HQM86P?ref_=d6k_applink_bb_marketplace
continuing... I found this book incredibly helpful in understanding what it does and how to live with it. Coping With Prednisone and Other Cortisone-Related Medicines : It May Work Miracles, but How Do You Handle the Side Effects?: Zukerman, Eugenia, Ingelfinger, Julie R.: 9780312155025: AmazonSmile: Books