Help, sick animals!

I'm looking for any information that may be able to help.  Currently I
have 2 kids and one lamb suffering with loss of condition, blindness,
parlyzation, frothing, seizures and have since had a lamb die.  They
have a diet consisting of corn ra****on, hay and fresh water.  All of my
does and ewes are fine and recieve the same diet.  The only difference
is that the kids are inside our barn, and out does are not.  Currently
we cannot pin-point what mayhave come into contact with the animals,
other than they might have some sort of poisining from something.   If
anyone thinks they may be able to help it would be great.

K.