You have my condolences, I have a cat too who is the same.
Apparently when they hide from people it is a sign that they are really really sick. My discharge is this like poop? It would mean some sort of upset in the digestive tract. Mines is pooping bright red bloody mucus. But because it is so runny it is just dripping from him....gross I know.
I like SugarCatMom said, go to the vet. I wish you the best of luck.