I've just had my ninth injection (I've also been on 5000mcg methylcobalamin sublinguals for 4 weeks) and not only have I yet to experience any improvement in my main symptoms, I seem to be going backwards. A week after I started the sublinguals my joint pain and weakness eased. A few days ago, my joint pain returned, and my legs are so weak I cannot even walk to the local supermarket 5 minutes away without feeling them about to buckle.
Last night I had a "restless" hand and today I have had pins and needles in my left hand. I know that pins and needles is a common B12 deficiency symptom- but it wasn't one which had affected me until today. I don't know if I should treat this as a deterioration? Or is there another explanation for the emergence of a new symptom? Has anybody else experienced this?