I tried to post earlier from my phone but couldn't. I've been active on the Yahoo Feline Assisted Feeding group since mid 2008. My cat Maverick almost died from FHL. Renovations is a reason your cat could have stopped eating. Anything that caused your cat stress. Have you joined this group? It is dedicated to owners assist feeding their cats just like this board is the experts on diabetes. I suggest you join asap.
The drugs your cat is on aren't the best for recovering from FHL. When you join the FAF group you will have access to some files to bring with you to your vet. Cerenia is good for acute vomiting but not good for general nausea from FHL. FHL is horribly nauseating. Your cat should NOT be on Mirtz at all. It would be like giving you an appetite stimulant when you have the flu. You may not be vomiting, you are still nauseated and pile an appetite stimulant on top of it. So discontinue this tonight.
The cornerstones of FHL treatment are:
1. Calories. These are medicine. You have to feed enough calories that your cat doesn't lose any more weight. The liver has to clear from being clogged with fat. Do you have a baby scale you can weigh your cat on? One that weighs to the ounce not a human scale? We have links on FAF on where to get inexpensive scales. Recovery RS and MaxCal are high in calories. AD is not. Even Wellness Chicken has more calories and can be used if blended well enough and strained.'
2. Antinausea medication. Ondansetron/Zofran or dolasetron are the most recommended. Reglan/Metoclopromide may be suggested by your vet but this will not work on cats for nausea unless the cause is stomach motility issues (throwing up food many hours after eating).
3. Liver supplements like Marin, denosyl or denamarin. It has proven to improve survivability.
4. Time. Do not push a cat to eat on their own or give appetite stimulants. They will eat when they are feeling better. Pushing a cat to eat can cause food aversions and you may have a cat that will not eat even after their liver is healed. Trust me on this. One cat on the FAF board had a cat with a PEG tube for three years. One day he started eating again. Food aversion is not something to play with. You have the tube, you should focus only on tube feeding for a couple of weeks. Then you slowly reintroduce foods before feedings, cut back on feedings and/or cut out feedings and only use tube feedings to supplement. It will be a like a switch is flicked and just one day he's eating enough. You keep the tube in for a full week after they are eating for peace of mind.
5. Pepcid. Some cats you do add pepcid with 1/4 of a Pepcid AC 10mg tablet to help with stomach acid. This does not help nausea.
Maverick's story is in my signature. It is my legacy to him, to educate owners on FHL so they never have to fight it themselves. I know he saves lives by me telling his story. But also to help people get through it. I had amazing people helping me and he would have died without FAF. I learned about online communities and found FDMB through them also. Amazing people.