Our tortie is over scratching her ears and eyes to the point where she has small scabs and thin fur above her eyes and two balding patches on the top of her ears. Inside ears look OK, no redness and she is fully de-flead and wormed. As it doesn't appear to be mites or an ear infection, that leaves allergies or stress. How do I determine which it is without going to the vets? Is Feliway worth a shot?