Hi there ~
Although pins and needles sensation or peripheral neuropathy
may be related to B12 deficiency, it is also likely that you need to get a neurological testing done and evaluated for any other neurological problem. Investigations for imaging your brain and spinal canal
can be helpful. It should be under good neuropsychiatric care and prescription of medications for any neurological condition or psychiatric condition like fibromyalgia
may be hugely beneficial. I hope this helps.
Take care and have a lovely day!