On my really bad days, I allow myself to just be upset. I allow myself to vent about normal daily stuff (that normally wouldn't get me there), I allow myself to get angry (but not take it out on people), I allow myself decent "alone time" complimented by decent time with my gf (just hanging, usually conversing over something anywhere from existential to "how that blue makes that painting better"). Ultimately, I allow myself to be myself but on a leash. I will not overstimulate or overwork myself anymore because it makes me that much more overwhelmed. Today isn't a terrible day, but it's not great, so I've just been educating myself on various subjects and ideas.