Ok. Just talked with a Vet at Ravenwood. (She was Very helpful!)
I told her about the symptoms, and the "Drunk-Like" behavior, not being able to stand upright, falling over, not being able to focus, and she said she can not guarantee without an exam and blood-work, but it sounds like "Mold Intoxication". She said it has been very damp lately, and they could have gotten into something moldy, and eaten it, and made them sick.
Which is Very, VERY possible, seeing as their coop is next to the woods, and there is a pile of very old leaves, and grass, and wood-chips back there that I have seen them digging in.
The Upside is, if he has not gotten any worse, as long as he gets healthy foods, it should pass, and he should get over it.
She did say some do not recover, but if he is eating and drinking, it is a good sign.
So for now, he is warm inside the house, wrapped in a blanket, and eating scrambled eggs at will.
*** Keep Your Fingers & Toes Crossed For Him ***