I understand Melanie is spell check for melafix but I can't figure out Chou, sorry. Not being critical at all, but maybe English is not your first language? Where do you live (in a vague way)? Country? State? Near a big city? Many of us are in the US but we're fairly international in some ways.
If you have a syringe or food bulb baster maybe you can shoot a bit of food in his mouth a little bite at a time. But like I said, he'll be ok without food for at LEAST another week. Don't panic!
It seems like clean water is helping, continue doing daily water changes or as best you can, as much as you can. What size is your tank?
The white eye can be helped by...you guessed it, water changes.
Have you tested your tank water for ammonia, nitrite & nitrate? Please tell us the numbers if you can, not just ok, we need to know actual numbers & the test used.
I "think" you can post to youtube & attach here but that's not something I do. I know some new people can post pics...but I don't know how to do that

I'm an old non-techie, sorry again.
Bottom line: change more water more often. Skip the salt & melafix, I don't think they're helping.