I'm a little annoyed after having him in the vet for 4 days they didn't give us specific recommendations about diet type. I had to look it up. All they said was try to give him food that will interest him in eating. We bought some dog food high in carbs and good, non-meat protein and he wont eat it (PetCo didn't have the Hill's l/d). He did eat some chicken breast we cooked up and put it in the dog food, but he mostly ignored the dog food. Today he wouldn't touch his food. I've done quite a bit of google searching on this. We also have another vet appointment tomorrow to do more blood work and see if it's gotten better or worse. I'm not seeing any change (listless, wont eat, dark urine, jaundice), so I'm not confident things have gotten better. We are going through deciding at what point we want to make the drastic decision of putting him down. At this point he will starve himself to death. But we will let the vet help us with that.
I'm so sorry to hear this. I lost my Snoopy to liver disease last June and my heart still aches. Your story so far sounds exactly like what we went through with Snoops, the jaundice, elevated pancreatic levels, no interest in food. $140 for blood tests every few weeks, when I already knew she wasn't feeling any better. We tried a bunch of different antibiotics and some other meds - I've forgotten now what all we tried. I also pleaded with the vet for a suitable diet, because there was so much conflicting information online on what as safe or unsafe, until I was wary of trying anything on her, but the vet was pretty nonspecific about what to try. We kept her going on different canned dog foods for months - we'd switch as soon as she lost interest in one; I even spoonfed her when that was the only way she'd eat.
Someone here suggested a diet specifically for dogs with liver problems, but I put my faith in the vet and didn't pursue the diet when the vet dismissed the suggestion. I regret now that we didn't try it, as I have since read that others had success with it. You can do an internet search and find the diet for dogs with liver or pancreas disease. I wouldn't discontinue vet visits, though if you go that route.
You may also want to try a raw diet. I'm trying to switch my chi's over to raw (my husband is the hold up on that, so they get raw when I feed them)
I hope you have a better outcome than we did - I'll keep you and your pooch in my thoughts. Hang in there.