Ah, I hear you @Teej now I think I understand where you're coming from.
Been there, still visit there sometimes when things are very, very bad. Hmmm.
That's when I have to be really self disciplined and do something like have a shower, have a hot cup of soup/ tea/ whatever, or a cold ice block, something that resets the system from a bit of a shock tactic so to speak.
I've turned the hose on myself outside to stop the agitation, shakes and need to run. Not really recommended, but it was useful and I got my equilibrium back.
Eating/ drinking water/ and properly regulating food/ water was vital in that period of time.
After settling, enjoyable pastimes like watchign something mindless or crocheting something needing attention would work. Rest and reset for a better next day.
Is this the sort of thing that's valid for how to manage the no good, horrible, very bad days?