My duck is in critical shape, he originally had a small spot of brown/red now it’s spread under both wings and going up the middle of his back. I found a golf ball sized mass in the middle of his stomach. He also has sticky eye (foam coming for his eyes). He seems very tired and wobbles when he walks as if he doesn’t have a lot of strength. He drinks water but only when I give it to him. He won’t eat but one grape. He won’t sit down, he only stands and pushes his body weight on the cage. It’s Labor Day tomorrow and I can’t take him to the vet for a couple more days. What should I do? What is wrong with him?