I'm so sorry to read your sad news about Punky. I pray that the long-shot that it's not FIP comes true. If it is FIP, there really isn't anything much you can do except make him comfortable until it's time to let him go. He's not an elderly cat, and I always think that makes it even more difficult to say goodbye because we expect many more years. Please keep us posted on your beautiful boy.

Sending get well wishes, Punky!