EMERGENCY!(Is it possible to give a Dehydrated kitten TOO MUCH Nutri-Cal???????)?

It is easy to hurt an animal coming back from severe dehydration by hydrating them too quickly. Basically the cells would take up the water so fast that they would burst. I don't think the eratic behavior you are describing is indicative of hydrating too quickly. I would suggest calling your vet and telling her/him the symptoms. It sounds like a neuro problem. I don't want to scare you so I will leave it at that - call your vet.