Aww, I am so sorry sweetie
I know how you are feeling. Well, somewhat anyway. My best friends Yorkie had Parvo at 12 weeks old and was in the hospital for almost 2 weeks. It was very, very hard on the poor little thing as she only weighed a pound and to be honest, she almost died several times. However, they took very good care of her at our vets office and they nursed her back to heath and today she is 2 years old and doing just fine
I know it has got to be SO incredibly hard for you not having your baby there with you, but just try to think of it this way - he is in good hands and this is for his own good. You will see him SOON and in the meantime, just be so thankful that you caught it in time and that he is being treated and will be a happy, healthy boy when you bring him home
P.S. - Can you go and visit him? We went and visited my friends Yorkie when she was in the "hospital" and it seemed to help alot
She was extremely happy to see us, and vice versa