No I don't believe there was any head injury, but neurological is what I'm wondering.  He is a KikiRiki Roo, he weighs 2 lbs. tiny little thing, he is two years old, I found him laying in the dirt yesterday while getting my hens in the coop, he was shivering, I noticed his pupils would dilate then get small etc.  At first I though he was trying to get out of my arms, but I soon figured he was having some type of spasm, I don't know what chickens look like when they have seizures, but either way he has never had any problems until now.  His comb tips look purple and I can see he is dehydrated for his comb look very dry. He tries to eat but misses the spoon.  He appears to have trouble swallowing, I have been giving him supplements in his water and gently letting drops of water drip onto the side of his beak.  If he swallows more than 5 drops of water that seems to put him into a spasm where he throws his neck backwards and stretches his legs forward, he will end up on his back.  He sleeps until I pick him up about every 20 min to get some drops of water in him.  Right now I made a little Bird Bistro (soft grain food for my Conure) that's what I am (trying really hard) to him.  He wants to eat but can't seem to.  We live in a small town and the only chicken vet we have only works on Fridays.