First, I'm jealous that you have a vet that'll do house calls!
My vet is a combo, traditional AND holistic. They have used a holistic treatment on my Ginger to help her get through a severe reaction to her last rabies shot and it worked wonders. I have NO clue what it was, something made from herbs that they fed her.
My Ferris is currently being treated with Flower Essences, and they have had a HUGE positive impact on his being able to get past his fears and panic. He is a feral rescue, and had emotional trauma based upon his capture and the month he spent living in a cage in foster care between 8-12 weeks old.
I can't explain why some of the holistic approaches work, but they have worked, for me so far, at least. I do like, however, that my vet will try traditional FIRST, then use a holistic approach.
I hope this helps you.