I have dementia. Frozen Brain is one of the worst things I have to deal with. No, you have not heard this term before as I made it up; technically, it is a loss of executive functioning.
But it feels like my brain is FROZEN and no amount of oiling the squeaky gears is going to get it moving in time to make a good decision.
A mind model (AKA mind map) is shown below. Click to expand the image.