The honest answer is that a raised B12 on its own usually causes none: any symptoms you do have are far more likely to belong to whatever caused the elevation than to the vitamin
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Monitor if you are hypotensive or on antihypertensives
Williams notes the following antidepressant options that may help treat neuropathy: Selective serotonin reuptake inhibitors (SSRIs), such as fluoxetine (Prozac) and sertraline (Zoloft), which restore the chemical balance in the nerve cells of the brain Serotonin and norepinephrine reuptake inhibitors (SNRIs), such as duloxetine (Cymbalta) and venlafaxine (Effexor), which inhibit the production and release of specific neurotransmitters, including serotonin and norepinephrine Norepinephrine reuptake inhibitors (NRIs), which inhibit the reuse of the neurotransmitters dopamine, serotonin, and norepinephrine Serotonin receptor modulators, such as trazodone (Oleptro), which increase the levels of serotonin and norepinephrine in the brain available to transmit signals to other nerves Common over-the-counter medications can provide some relief from mild-to-moderate neuropathic pain, according to Williams

If you need regular injections of vitamin B12, cyanocobalamin would need to be given once a month, whereas hydroxocobalamin can be given every 3 months