I'm so glad to hear that he seems a little perkier but I'm with Jan and think you need to force a few droppers of warmed up baby food. I really think he will feel better once he gets something in his tummy. It might come back out but he will get some nourishment from it. He probably won't like that either but you sadly sometimes we gotta do what we gotta do. Sometimes they find out that it tastes pretty darn good and decide they might like to eat after all.
Keep us posted.