Thanks for the advice, I'm honestly just relieved to hear that someone else experiences something similar. I'm terrible with taking breaks, I need to get better at it. I've certainly noticed the days when I'm not working at my computer are also days I'm not feeling terrible by 5pm.
> As I get older and nearing 40 now, I'm realizing the wisdom in all these things I've been told throughout the years but never had to heed before: Take _frequent_ breaks from monitors. Strive to take daily brisk walks (keeps my bp in check). Drink enough plain water (keeps some of my frequent headaches at bay). And so forth.
I'm almost 37 myself, and it might be time to accept that I'm not as young as I think I am anymore. I've convinced myself for years that I have plenty of time to worry about sleeping better, eating better, and exercising more when I'm older. But now I am older!