Pernicious Anaemia :: B12 - Low Cellular Levels, High Serum Levels After 5 Years Treatment

I found out I had a B12 deficiency 5 years ago.  My levels were very dangerously low at the cellular/functional level.  I was told I was near paralysis. Now, after 5 years, they are still low.  They have come up to almost borderline, but it still flags red on my tests.  My serum levels though are too high for the lab to measure! Its just not getting into my cells so it's not able to be used.  I do twice a week injections plus twice a month IV B12 and still it has taken my body 5 years just to go up a little bit. I feel the effects of the shot for about 15 hours barely then I just feel awful again, thankfully it's prescribed every 2 days.  But I don't want to do it every 2 days forever! 

In the beginning I was told it would take a month or two to get my body back to normal and then just a shot every few months for maintenance. My drs have not only increased my dose but also the frequency and STILL after all these years I'm deficient.