So you had these symptoms while still in Pakistan?

Have you been screened for diseases that may occur there?

Your B12 is coming down.... and now is borderline.
What exactly does your B12 label say? I cannot find it on the net. Type and dose / tablet?

Do you have rashes? Are you taking high dose niacin in your vitamins from that naturopath? Niacin causes skin flushing and burning/prickling.

A good Centrum senior would have most RDA things in it. (vitamins and minerals).

Are you a vegan? Or do you eat meat?

Do you consume fatty fish like salmon regularly?

Are you exposed to pesticides? Solvents in hobbies, or furniture refinishing? Dry cleaned clothes often?