Given how fast this came on...and the symptoms you've pictured and described...I think this is a possibility. The neurological symptoms could be caused by things like chemicals or overheating...but the crusty junk on his nose and the spots on the skin indicate a systemic infection. A bad one.
Please know this though...we're NOT vets...and even a vet (an honest one, anyhow) would tell you that no one can make a diagnosis over the Internet. All we can do is guess...and there's nothing we can do to help make it better.
I'm really, really sorry. I don't think your little one is going to make it. Even if you found a vet qualified to diagnose and prescribe medicines...it looks like that little one is too far gone for treatment.
If I were in your situation, I would euthanize the poor thing. I would also dispose of the enclosures and all the stuff inside of them. You should also inform the person you got the snake from because his collection may be infected as well. I for sure would NEVER accept another animal from that person.
Again...so sorry!
I will take him to a normal pet vet for euthanize now Hope they are capable to do that