Thanks Mrs. D, Brian and ginnie for your replies!

I'm sorry to hear that recovery can take so long, but at least I know what I need today.

I'll just keep updating my status on this page in case others want to read.

I have been taking 5000mcg/day (methylB12) in divided doses sublingually for the last 3 or 4 days. I also added about 1000mcg/day of dibencozide starting yesterday.

Today I got a B12 shot of cyanocobalamin. Within 15 minutes I was very drowsy, but stayed awake. Definitely felt a little 'out of it' or disassociated from reality. An hour later I just had to take a nap and slept for 2 hours. Hope this is a normal reaction. Just ate a bunch of potassium rich foods.

I've got a new appointment with another doctor next week who may be willing to bump up my B12 shot frequency to at least weekly.

Some of the numbness in my legs has improved slightly over the last day or 2, although they still feel very weak. New symptom yesterday morning (before taking dibencozide): sudden weakness/zapping in my forearms and hands. It made it difficult to squeeze anything and was pretty scary. Today my forearms still feel a little weak, but way better than yesterday.

I spare a thought today to those who have been dealing with this for a long time and those who have yet to discover their own B12 deficiency.