That's always the problem isn't it @Freddd, that many of these symptoms are similar to other B deficiencies.
Regarding the nervous disorders, the only thing that stands out for me is the emphasis on the "syndrome of drastic swings between lethargy and hyperexcitability -- and that thiamine often helped stabilize them", perhaps due to helping control or stabilize blood sugar issues.
Regarding the nervous disorders, the only thing that stands out for me is the emphasis on the "syndrome of drastic swings between lethargy and hyperexcitability -- and that thiamine often helped stabilize them", perhaps due to helping control or stabilize blood sugar issues.