I didn’t know vitamin E deficiency could cause neurological problems until I was researching for my duckling. Vitamin E deficiency causes something called “Crazy chick disease”. You can read about it more on this forum if you search in the search bar. It aggressive many poultry species apparently.
. He acted like he was gonna make a turnaround, kept trying to push his way out of the egg I put him in so I took him out amd let him run around which he was actually able to do for the 1st time. He was running into things and would fall occasionally and other chicks would peck at him amd after few minutes he wore out and started laying on his back so I put him back in his egg separate from the others and continued giving him the vitamins and electrolyte mix I made for him which he would take well from a dropper but couldn't get him to drink on his own or take food at all. I mixed up some honey, ACV, and garlic solution for the electrolytes and then started giving him the vit E and selenium. Then late last night I went down to give him another dose and feeding and found him gone. He had started to hold his neck better and really thought he might actually pull thru but then he didn't. The other babies that had yolk left unabsorbed and the one I had to assist so much are doing great, you would never know they had any issues at all so I ended up with 5 healthy babies out of the 14 eggs I incubated so I'm pretty disappointed but thankful for the healthy ones and all the help.
You did everything you could and maybe there was something internal wrong.
