My heart goes out to you cause I know exactly how you feel.
When I had to go to Mississauga, Ontario, for my nephew's wedding, I had to leave Buddy & Katie. I drove my sons nuts with all the instructions on what to do with my babies. They were, "Yes Mom, we know Mom, don't worry Mom."
While I was in Mississauga, I called 3 times to see how the animals were.

Like Cataholic said, enjoy your time, cause they will be extra happy to see you.

Have a safe trip.