After a snake goes into blue, there is a period that the eyes clean up and it looks like the snake has shed, except that you can't find the shed. This is normal. He should shed in a few days. Also its common for snakes to not eat while in shed. Some will, some won't. It depends on the snake.
Also his hot side is wayyyyy too hot. 90 tops. None of this 100 business. Get it turned down now please. 87-90 got side and 80ish for cold side. He's was probly active because he was too hot and couldn't find a cool place.
Also you mentioned mucus. Do some research on snakes upper respiratory infections. I don't have any experience with them myself, but there are a few members that have battled them and one. It can be very serious so good luck. I hope this helps.