This might be more information than you are wanting. however this is only one part of what I have found and these are some of my symptoms.
I hope this help you.
Vitamin B12 deficiency
Nervous system
A lack of vitamin B12 can affect your nervous system (the brain, nerves and spinal cord). For example, you may experience:
• vision problems
• memory loss
• paraesthesia (pins and needles) – a prickling or tingling feeling in the arms, legs, hands or feet
• ataxia – the loss of physical coordination, which can affect your whole body and cause difficulty speaking or walking
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Vitamin B12 deficiency can potentially cause severe and irreversible damage, especially to the brain and nervous system. At levels only slightly lower than normal, a range of symptoms such as fatigue, depression, and poor memory may be experienced.[1] However, these symptoms by themselves are too nonspecific to diagnose deficiency of the vitamin.
Vitamin B12 deficiency can also cause symptoms of mania and psychosis.[15][16] Vitamin B12 deficiency can be caused by the metabolic disorder pernicious anemia.
NOTE: is inform. Came from :wikipedia vitamin B-12
Mania - : excitement of psychotic proportions manifested by mental and physical hyperactivity, disorganization of behavior, and elevation of mood; specifically : the manic phase of bipolar disorder
Psychosis - Psychosis may involve delusional beliefs, some of which are paranoid in nature. Karl Jaspers has classified psychotic delusions into primary and secondary types. Primary delusions are defined as arising suddenly and not being comprehensible in terms of normal mental processes, whereas secondary delusions may be understood as being influenced by the person's background or current situation (e.g., ethnic or sexual orientation, religious beliefs, superstitious belief).[4]
Thought disorder
Thought disorder describes an underlying disturbance to conscious thought and is classified largely by its effects on speech and writing. Affected persons show loosening of associations, that is, a disconnection and disorganization of the semantic content of speech and writing. In the severe form speech becomes incomprehensible and nutritional deficiency, such as vitamin B12 deficiency
withdrawal, of a large number of medications may provoke psychotic symptoms.[7] Drugs that can induce psychosis experimentally and/or in a significant proportion of patients include amphetamine and other sympathomimetics, dopamine agonists, ketamine, corticosteroids (often with mood changes in addition), and some anticonvulsants such as vigabatrin