Though exacerbated by anxiety, the involvement of a rash on the abdomen leads me to believe an allergy is the root of the problem. At the sanctuary these types of dogs are tested by Heska lab to determine what they are allergic to. Then a serum is developed to give injections to reduce their sensitivity. In addition we use a hypoallergenic diet, which you are doing already, use prednisone and antihistamines as needed, bathe regularly in medicated shampoo, and use antibiotics when there is an exacerbation. These animals are never cured! They need treatment to stay under control. For the anxiety, try amitriptylline as it may not cause as much drowsiness.