Consult a general physician to address the documented B12 and vitamin D deficiencies and ongoing neurological symptoms. Start medically supervised vitamin B12 replacement promptly. Depending on the clinical examination, intramuscular B12 injections may be preferable, particularly if neuropathy is suspected. Vitamin D replacement is also necessary. Your doctor may prescribe a high-dose vitamin D regimen followed by maintenance supplementation. Investigations may include CBC, repeat vitamin B12, calcium, magnesium, potassium, TSH, kidney function, and HbA1c, depending on previous results. A neurologist consultation is advisable if burning sensations, twitching, or weakness persist. Nerve conduction studies or EMG may be considered if indicated. For recurrent palpitations, an ECG and possibly Holter monitoring may be useful. Continue receiving appropriate mental health care for OCD and anxiety. Cognitive behavioural therapy with exposure and response prevention (ERP) is an effective treatment for OCD.

Maintain regular sleeping hours, adequate hydration, balanced nutrition, and moderate physical activity as tolerated. Avoid excessive caffeine, energy drinks, and unnecessary supplements, particularly high-dose vitamin B6, which can itself cause neuropathy. Vitamin B12-related neurological symptoms may take weeks to months to improve after treatment, and recovery depends partly on how long the deficiency has been present. Seek medical attention if you develop progressive muscle weakness, difficulty walking, loss of balance, fainting, chest pain, or persistent rapid palpitations. My recommendation: Correcting your documented vitamin B12 and vitamin D deficiencies should be the immediate priority. Anxiety may be contributing to the symptoms, but it would be inappropriate to assume that it explains everything. Your deficiencies are treatable, and appropriate treatment offers a reasonable prospect of improvement. Wishing you a speedy recovery!