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Vitamin B12 injections begin working almost immediately at a cellular level, though the timeframe for noticeable symptom improvement varies considerably between individuals

Common Symptoms of a Vitamin B12 Deficiency If you think you may be low, watch out for these symptoms: Feeling tired, fatigue and weakness Loss of appetite Constipation Weight loss Megaloblastic anemia Numbness and tingling Poor balance or coordination Confusion Memory loss Depression (21) Soreness of mouth and/or tongue (22) Be aware that many symptoms of B12 deficiency overlap with symptoms of other health conditions, so it's important to see your doctor for a definitive diagnosis

[9] Patients should be advised to contact their healthcare provider if they experience any severe or persistent side effects, such as difficulty breathing, chest tightness, severe rash, or dizziness

Physical therapists are also very useful for treating potential causes for post-traumatic headache

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