There is a compounded drug from West Lab Pharmacy, Acetylcysteine and Aminocaproic Acid,www.westlabpharmacy.com, they use it for German Shephards, my mom used it on one of her dogs that had similar symptoms and she showed a drastic improvement.

PS; I cried when I read your post initially. It took me a little while to answer because it sounded exactly what we went through with our girl. The pred did help as needed, 1/2 a deramax a few times a week too. I kept saying I was losing my senior girl daily but she rallied, fairly comfortably except for the LP when excited and for food smells also. Pizza deliveries where almost impossible.

Our girl survived 2.5 years after being diagnosed with both. The LP actually got better not worse but never disappeared. Take it 1 day at a time. They may add up.