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Hello, this is Dr. Jess. I am very sorry to hear about your dog. I would strongly recommend getting him in to your vet ASAP for an exam and bloodwork. His symptoms could be a sign of systemic or metabolic disease such as liver or kidney problems or problems with blood sugar regulation. We also worry in older dogs who have never had seizures before about brain tumors and lesions, but if he is having the other issues (the heaving and disorientation), we would want to check his bloodwork to determine there isn't an underlying systemic problem we can address. These are not something you want to ignore, considering the fact that he has continued to have seizures and now has other symptoms (the disorientation and heaving).