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Poor sleep worsens fatigue, headaches, and stress tolerance

If the cause isn't dietary then it is an absorption problem so you need to find another way of replenishing B12 initially

Histoire naturelle de la lipodystrophie cervicofaciale cortico-induite: suivi prospectif dune cohorte de 37 patients [Natural history of corticosteroid-induced lipodystrophy: a prospective follow-up of 37 patients]

Key Preclinical Study (Neelakantan et al., 2018): Treatment in diet-induced obese mice produced progressive body weight loss, reduced white adipose tissue mass and adipocyte size, decreased total cholesterol, and no changes in food intake effects were metabolic, not appetite-driven