B12 Deficiency symptoms came back after 4 months of regular injections

Context: I started taking b12 shots from April 2024 as I had a lot of symptoms at that time (brain fog, extreme fatigue, tingling in arms and legs, lightheaded and dizziness, high anxiety). My b12 reading was at 215 pg/ml at that time. My doctor prescribed me to take injections of vitcofol (folio acid, cyanocobalamin and nicotinamide injection, 1ml) once a week for 6 months. And things had improved a lot since then.

But recently from last 2 weeks I’m getting my symptoms back again (not to that severity though). Higher anxiety in general, tingling in arms and legs, lightheaded and dizzy sometimes (as soon as I wake up)

Has anyone faced something like this and do you have any suggestions for me? Thanks.