What is a Sort?

I was raised here in Pushmataha County and learned to understand what I always took to be the English language.
I’m not the most educated person on the terrestrial ball we call earth.
But, at the same time, I don’t consider myself to be a “dummy” either.
There are many things we call adages used in the language around here that might confuse folks.
Even I get confused by some of them.
One that I could use some enlightenment on is, “I’m just out of sorts.”
Now, as far as I know, I have never seen a sort.
What, pray tell, is a sort?
Is it something that you buy at a store?
Is it mandatory that I have some of them?
I’ve lived all these years; and, as far as I know, there’s never been one in my possession.
Do I need some?
Where do I find them, and what do they look like?
Is sorts some kind of medicine I need to be on?
Undoubtedly my wife was on a regimen of it, because, when I got up this morning, I bounced into the kitchen and calmly asked my darling wife, “Is that bread I smell burning?”
She yelled out at me, “Don’t start on me this morning. I’m out of sorts”, then stomped out of the kitchen in a huff.
Now if I had had any idea she was out, I would have gone to all lengths to see that she got some more--if only I knew where to get them.
She came back in the kitchen after a few minutes and cooked breakfast.
Now during the time it took her to fix it, I commented on the fact of her being out of sorts, after which, I had to undergo much tongue lashing, burned toast instead of scratch biscuits, two objects, which I later learned were eggs instead of Frisbees.
And I am most assuredly convinced that I have the only wife in the entirety of Southeast Oklahoma that can cook three kinds of gravy in the same skillet: “Thick, thin and lumpy”---upon which, I commented and was very promptly instructed that I could either “eat it or wear it!”
Is there anyone, I repeat, anyone out there who knows what a sort is?
If so, would you PLEASE let me know so I can get back in the house.
Pluto sure has a cold nose, and his breath certainly does not smell like peppermint.

A confused,
Ray Pool