His distended throat area is making me think he has a respiratory infection. Is he wheezing, popping? Bubbles coming out of his mouth or nose? Does he yawn alot?

What are his temperatures and humidity?

I would seriously get him to the veterinarian as you may have a very sick snake on your hands. And yes, if you've been keeping him around your corn snake, it's very possible that your Corn could get sick too.