Sometimes, if numbness is present, when people start the nutrients to begin healing, the numbness is replaced by increased sensations as the nerves "wake up". This is temporary.

Also if one is really low in B12, beginning it may temporarily reduce potassium in the serum. This is because the B12 stimulates the bone marrow to make new blood cells which deplete potassium.

So eating potassium rich foods may help with this. Normally this is not a long lasting effect either, as the bone marrow will stop
when it senses enough blood cells have been manufactured.

Lyrica and gabapentin are strange, in that they cause rapid tolerance in some people. They do not work equally for everyone or predictably.