I had a similar experience when I started taking B vitamin supplements regularly. (And there is extensive evidence which suggests that I am incapable of getting sufficient B vitamins without supplementation, both in my own medical history of gastric issues and my brother's illness. So while I suspect strongly that I have more depression on top of the nutritional deficiency, treating the deficiency is an excellent start, and is usually sufficient to render me functional.)

yezida is very fond of the 'having a breath to think rather than just respond' as an essential component of the capacity for right action.