I dont know what else to do.. help

It almost sounds like your oscar was/is suffering from Pop-eye.
 
Also, unless you're raising the feeders yourself, there's a good possibility that they carried in whatever is ailing your oscar. I'd stick with either home-raised guppies or other feeders, or a good quality pellet food.
 
I think we'll give him another week to try to get him eating again...

Although the more i think about it.. even if by some miracle he does start eating, I would never be able to put him back in the big tank with the other Oscars.
 
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