If nerve demyelination is truly your problem, find a doctor that will read the journal articles and prescribe what you need. It has been shown that the simple asthma drug, Theophyline, stimulates myelin growth in both the central and peripheral nervous systems! From 2020 in Nature Communications journal:
https://doi.org/10.1038/s41467-020-17243-z See page 5 bottom, left.