Cyanide is usually treated with a specific strain of Vitamin B12 in mammals from what I can recall... I think hydroxocobalamin is the one? The natural form, not synthetic. I don't know what kind of dosage you'd need for an emu though... I also could be very wrong, but I thought cyanide was a...
Your best bet might be to call an avian vet and see if they could tell you what to use for antibiotics or how to use it. It might be an infected or blocked sinus.
Don't have any other recommendations outside of that, sorry, aside from maybe try and see if you can get electrolytes into him and...