in your first post in this thread you stated "I hope I’m not about to have a meltdown"

that depends upon what a meltdown is in your location....

here where I am a "meltdown" is when an uncontrollable reaction to when someone .......is........ feeling so emotional, so much anger, that they cry uncontrollably, lashing out at other people, some people throw things, do damage, ... children usually toddlers have meltdowns frequently aka temper tantrums when they have so many feelings and emotions and thoughts going on in their heads that they cant handle it. many adults who go through this go through this when they go through the rages, crying associated with menopaause.

I myself go through "meltdowns" occasionally due to my MS and my Depression.

here where I am having an empty brain (no thoughts, no emotions, wanting to stare at walls all day, giving up the fight, ...) is called many things like depression, calmness, relaxation, meditation and other things...

my suggestion if you think you are heading for a "meltdown" talk with your treatment providers. theres treatment for this. and the same for if this mind quietness bothers you.