> He's 8, spent one year in shelter since everytime someone entered room he was hiding, so no one took him.
Yeah. As you're obviously aware, this cat will require extensive and persistent training. Older animals that are surrendered to a shelter are not-infrequently difficult to train or deal with.
People who are -for whatever reason- unable to properly train their animal will often surrender their poorly-socialized and poorly-trained creature to a shelter, where it becomes someone else's problem. It kinda sounds like you ended up with one of those kitties.
Anyway. Do you have a cat tree or similar carpeted furniture that is -explicitly- for the cat to claw, chew, and otherwise demolish? If you don't, you definitely should get one or more such items. They're kinda pricey, but:
1) Cats with claws are going to scratch things. It's what they do, it's impossible to stop, and it pleases them to scratch things.
2) Cat trees/furniture are almost always less expensive than nice human furniture. :)
For our cats, occasionally spreading catnip on new cat furniture and encouraging them when they scratched it rather than the human furniture was quite enough to make them stop scratching couches and the like. (You might go so far as to scratch the cat furniture with your hands in view of your cat while making whatever noises of approval you make when the cat does something good.)
Once a cat gets it into its head that that cat furniture is its furniture, you don't need to go to great lengths to convince the cat to scratch on the new furniture when it inevitably becomes time to replace the worn-out stuff.
Cat vomit is an unavoidable part of cat ownership. If the cat vomit doesn't nearly always contain a hairball, it's entirely possible that the cat's food doesn't agree with its digestive system. As our cats aged, food that was once perfectly acceptable started to disagree with them, and we went through a multi-month search to find foods that agreed with them.
Sadly, I have no advice for the out-of-litterbox shitting and pissing. I've never had to box train an old cat. :( If a cat is unhappy or angry, it may choose to fail to use its litterbox. So, the problem could be more than just the wrong type of litter. But -really- I have no freaking clue. :(
Best of luck with your cat. I do hope that you can figure out what he needs to be happy, comfortable, and keep all his shit contained in his shitbox. :)