Sorry to hear about your goat problems. I have some ideas that should help.
Lets concentrate on what you can do now to help your goat before your veterinarian can arrive to help.
Make sure he has protection from the environment. Either keep him protected from the cold and windy weather or make sure he is cool with a fan or breeze if in hot temperatures.
Keep other goats and/or livestock away from him. If he has a sickness we want to try and isolate him from others and we don't want him being picked on.
This should allow you to help your goat until your veterinarian can get there and determine what was the cause of his sickness. Any more questions please let me know.