
Hi,
Have you looked at Bach Flower Remedys? There are lots of them, and some are specifically for anxiety, greif, stress etc.
Also, on my dogs i have used Valerian, which helps to calm them down. As with most herbal stuff, the longer you use it for the better it can work, and also, it doesnt work for everyone!
Id give the dog herbal remedy, and then go back to square one, letting it get used to being alone gradually.
Provide toys such as kongs, that can be filled with food to entertain the dog. and dont reward it by going back to it if it making a racket!
Good luck,
Em