So sorry to hear about all the worry you have with your new pup, we had the same with Kalli, she was kept in on a drip of fluids and antibiotics,
the vet rang us at 10pm and told us she had eaten a very small amount of food
, then she rang in the morning to tell us that she had chewed all her lines out in the night, scoffed all her breakie and was sat up as bright as a button.
Kalli has thrived since and we are now enjoying our baby instead of worrying 24/7. You will be doing the same in no time at all. Best wishes.