I know what you mean about worrying about separation anxiety. I worry about Teddy that way when it comes to the vet, but he does okay. Joey will do great and be back home snuggling with you and Callie before you know it.
Max tried to jump in the first 24 hours and found out it didn't feel very good. Wasn't too hard after that to keep him somewhat calm. We played calm fetch and tug-o-war, and I carried him on his walking route for about 10 days. No bath for 2 weeks.
Best wishes for your little Joey.