@salakala I just started taking vitamin d the past week, good to know.
Also, I don't know if I can generalize this but as someone on ADHD meds (methylphenidate) I've reduced my coffee intake to maybe just one cup on the weekends, my only source of caffeine, and that has been a significant boost to feeling better. Especially with afternoon crashes, they're not anywhere near as brutal. Don't know if you experience that though.