I have no experience at all, but a few ideas.......I think that you mean B6 deficiency rater than B12.
Many doctors have come round to the thing that CPS is associated with B6 deficiency and the combination of this plus anti-inflammatories e.g Ibuprofen produce good results, as good as surgery.
You have intense pain at night and this would suggest an advanced stage of CPS.
If it were me, I would want blood tests to exclude B6 or B12 deficiency and if they were normal, would submit to surgery.