I think it's a good idea that you're getting a second opinion from another vet, hopefully one that is experienced with reptiles and snakes in particular.

It does sound neurological, but hopefully the new vet will be able to make a correct diagnosis. You might also have to consider assist-feeding if your snake is losing too much weight or is too weak to eat on his own. Force feeding should only be used as a last resort, but assist feeding isn't nearly as stressful. Essentially you will have to place a small, prekilled mouse in your snakes mouth and pull on the mouse a little to latch on to his teeth. Then just leave hi alone and allow him to continue to swallow. Sometimes it takes two or three attempts to get it to work.

Your vet should be able to tell if you if its necessary, though. It's much less stressful to allow your snake to eat on his own, but sometimes you might not have that luxury.

Good luck!