John, you should keep your levels of B12 higher than that. Were you also taking folate? The shots don't work so well without it.

I am one of ones with plumbing issues too, but I am not reading too much into it, as I know I get neuropathy when my B12 is low. My blood pressure can go quite high and then drop heavily, I have very dry skin and the stuff you mention. V little tremor.