If you haven't supplemented then try repeating the serum B12 test - if there has been a significant drop - more than 20% then that is good evidence that you have an absorption problem.
Otherwise you could have a genetic problem with metabolising B12 - though they are quite rare - and may need higher levels of B12 to ensure that your cells get enough to run all the processes they need to run.
Not sure about the blood pressure - would suggest seeing your GP about that one - certainly looks on the low side.
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