I have tried to do a lot of reading here, but there's a LOT to cover. My apologies if this has been discussed before and I didn't see it.

My doctor tested my B12 as soon as I began experiencing pain in my feet 13 years ago. (I have PN). He kept telling me it was normal. However, in May 2013 I saw a specialist when I could not sleep (literally, did not sleep for days/weeks), got confused easily, lost my up-close hearing & had my distance hearing go massively hyper-sensitive, had difficulty breathing, my heart started hurting and I began falling down. He found my B12 to be 130 and ordered my doctor to immediately begin B12 injections. I got weekly 1000mcg (I believe) injections for 2 months, then bi-weekly for 2 months, and I now get them monthly. It took 9 months for my hearing to come back. I am sleeping better but still have issues. My last blood test was 325-ish. My doctor says this is in the normal range, but I don't think so. My specialist said he thinks my PN could easily be from prolonged B12 deficiency.

I am 38, and have totally normal stomach acid levels. I take an oral B12 but my doc says I am unable to absorb it. I only feel better for a few days after each injection. What SHOULD my minimum level be? Should I be striving to get it up to 600? 700?