Vomiting and loss of appetite is concerning when dealing with liver disease. Regardless, you may still want to call the vet in the morning, just to touch base. Also, check Minky's eyes and gums for any signs of yellowing/jaundice. Try to keep him drinking too, especially with the vomiting. I've dealt with liver problems in my dogs as well. Not stories that need to be shared on this thread -- this is thread of support for sweet Minky and his Mama. Still keeping you both in my prayers. I so understand what you mean about the rapid aging. I also understand about the thunderstorms. One of my Scotties is sitting next to me on the couch all dressed up in her Thundershirt in preparation.
Have you tried any liver support supplements? I used a supplement called Denamarin (basically milk thistle and SAM-e) when one of mine had hepatitis. We saw some dramatic short-term improvements in liver values using this along with her antibiotic. Of course this is something to check with vet about.