aww...I am so sorry to hear about your puppy. I wish I knew what to say, but I had none of these issues with mine though it sounds like excellent advice on here. ;o) I was told honey is good to bring their sugar up. that is what I was told for my yorkie, Thankfully I never had too. then again she came to me at 13 weeks of age. she was winged from mama, eating on her own puppy kibble & potty training had been started. I hope your pup gets better.
good luck to you.