Persistent dizziness and balance issues suggest your body may need a more frequent vitamin B12 injection schedule. Monthly doses are often insufficient when neurological symptoms are present; more frequent injections (like weekly) are typically preferred initially to aid recovery. To determine if there is any nerve involvement, a doctor or neurologist can perform a clinical evaluation, nerve conduction studies, or check blood levels of Methylmalonic Acid (MMA). Please don't worry, as nerve pathways can recover well once optimal vitamin levels are consistently maintained. I highly recommend consulting your physician to discuss adjusting your dose frequency and evaluating these ongoing symptoms.