Watched both videos. The zooming into hide and spazzing on side to *me* and my b/f look like a terrified snake. You've got stuff in the hide (I assume to make it snugger) and he's pushing like crazy against it and the hide making it flop. I personally don't see a neuro issue here, I see a terrified snake (I COULD BE WRONG!). I've seen the zoom, going half stiff, when trying to escape which is what I am basing my opinion on plus his otherwise normal movements in the rest of the video.
I know you said the bird isn't a big deal, but I really think it is. You should block any visual access they have to each other. I've seen snakes terrified of a moving ceiling fan before. Birds are natural predators of reptiles.
It's at least worth a shot to see if it helps improve the situation if you aren't going to the vet yet. Vet visit would be good to help try to rule out a neuro isssue... just giving my and my b/f's feedback based on what we see in both videos.