My Poor Puppy

I hate it when my dog doesn't feel good.  It is a helpless feeling.  My oldest dog, CT (7 years old), is having a bad week.  He has been throwing up here and there and coughing, burping and licking non-stop.  Today we took him to the Vet because it is not like him to turn down a meal and he was being more aggressive than usual, even to me.  They asked a million questions and did a bunch of tests with no definite answers.  They gave him a shot to help with nausea, antibiotics, special bland food and told us to come back if he doesn't get better.
He was so good at the Vet he had a thermometer stuck somewhere, blood drawn and a shot and still wagged his tail and gave the Vet kisses.  He ate his duck and potato dinner, with antibiotic pill in it, and he is keeping it down but having trouble resting because of all the licking, burping and coughing.  I wish I could magically make him better.  If I am this upset about my dog, I don't think I could handle kids!