@Micki
How long have you been giving the polyvisol? too much A and D3 is not good and if you have exceeded the recommended on week daily/the next week taper off, then stop.
Put him on AviaCharge 2000 (this is formulated not at therapeutic (high) dosage but as a complete daily supplement...
Here is some of my collected info on neurological symptoms of crookneck/limberneck:
http://dlhunicorn.conforums.com/index.cgi?board=emergencies&action=display&num=1160928615
re vit. supplementation:
Please note that vitamin E (at therapeutic dosage) is absorbed only in combination with...