Interesting. You may probably benefit from taking the active form of B12, methyl cobalamin.
You could start with a low dose in the range of 100-200 mg and increase over time, without rushing it.
Methyl-B12 is typically more stimulant as it crosses the brain blood barrier.
Lastly, if methyl-B12 works okay you should accompany it with some methylfolate, 200-400mcg typically.
Cheers