The liver is the organ that cleans us so it takes a right beating. It is often where cats and dogs get infected or have lesions towards the end of their lives.
There is a theory amongst vets that cats cannot detox as well as us, or dogs. So water pollution and food additives get them worse. I think I believe this to be true as the numbers of cats with liver problems has risen greatly lately.
Cats are meant to eat much of their food raw and all of the processed stuff we give them is not good for them. There is a vet now who advcates some rae meat mixed with things like spirulina. But you just try getting an old cat who loves his Science Diet to let go of that ! Mine were very fussy.
I lost two cats in the last few months to liver tumours. One was at home with us for a few months but the other went very suddenly.
The one thing they had in common was sudden weight loss, vomiting and loss of appetite. I made a soup like food for one of them who became dehydrated. Just boiled some chicken bones, bit of meat and carrots and peas then wizzed it all up in the mixer. (without the bones natch). He loved it and it got him going again for a few more weeks.
Aldaniti, I really hope your cat will be okay. But, you know we have to accept that they do not last as long as we do, or as long as we want them to. I miss mine terribly, and just keep telling myself I was lucky to have known them. And despite the pain when they go, I would not give up having had them. Think you feel the same.
You could also get the cat some Rescue Remedy. I gave mine that plus Crab Apple which is for cleanisng, helps to detox the liver. Just make sure you dilute it in their drinking water, 4 drops of RR and 2 of Crab Apple. Fresh water each day for a week.
Best of luck ......