As I've said in the other thread, imho there is more going on then just the "spider thing" or head wobble. Of course I could be wrong, though..
This sounds like severe neurological damage.
Can be caused by many things. Since the snake wasn't in your possession until very recently, any damage due to fumes (bug treatments, glues, paint, etc) or heat could have happened at the former home and you probably will never find out for sure.
I would be far more worried about the possibility of a serious disease. No one should be paranoid and see "IBD" in every funky thing a snake does, BUT its also not smart to just ignore the possibilities esp in light of the snakes behavior. And its not just IBD, there are other serious diseases to worry about.
All you can do is either wait and see if the snake gets better, take it to a Vet and get any test that can be done on a living animal, or put the snake down.
Either way, I would be going out of my way to practice the STRICTEST quarantine possible.