I have one spider, and he does not wobble or spin, but I have heard of others that do. You asked if you should take him to the vet. If it is just the spider wobble, then I would not take him to the vet, because the vet is most likely not going to know what is going on with him, and diagnose your snake with IBD. From what I have heard most vets diagnose snakes with any neurological problems with IBD, even though most do not have IBD. If this were IBD, your snake would pass away very quickly, so most likely it is not IBD. Hope this helps.