It seems that I have in some regions a lack of vit B1, vit2 and biotin. I am improving in first place by a lower manganese diet, very slowly but really nice enough. Now, taking these vitamins helps me after eating, I experience this since two months or so, but stopped for three weeks, so need to look at it further. With protein meals the effect was much greater for some reason. (I must not take vit B6.)
The second thing are metals, here it seems not be a deficiency or an overload, but a misplacement (caused by a high Mn diet in my case after two infections), so redistrubuting them. This as well is strong. Chelating them can be done with lemos (citrate acid is a metal chelator), so I put juice from a lemon into 1l water, drinking it over some time (using a straw, not to decay the teeth). As an intake I eat or drink (milk) chocolate, not a whole bar though, 9-37g. Will investigate later in more detail, so far I am thinking on Cr, Zn, Al, Ni (I take extra Se). Ag also has an effect. (I think this metal thing could be detrimental if other strong influences on the illness would worsen the health.) I take vit B12 with the lemon juice.
On top of my Mn-improvment (ah yea, chocolate contains a Mn-chelator, oxal acid), I think the nerves can come to new or better life only when there is the stuff they need, vit´s and metals.