I find it interesting that you have an ulcer, and diet doesn't seem to be contributing factor. What little I understand of the biology/biochemistry, is that our bodies need very little B6, and our gut microbiome is key to getting it from food sources to be stored in the body (liver?) where it is used for other metabolic needs.
As we age our bodies do undergo a lot of changes not well understood by medical science...yet
Statins can also cause neuropathy (as does excess B6) Some alternatives are to discuss statin dose and form (fat soluble v water soluble) versus alternatives with your doctor, if neuropathy is one of the issues. Our biology is complex and often genetics plays a role that is not clearly delineated yet.