Honestly bro get your cat off that stuff asap, i know a monkey that used to get on alot of uppers man and it was a down hill spiral
staying clean is always the best way to go about life, if your cat need to get off everything its on, get your hands on some valliums and give your cat 1 or 2 to get the edge off but not too much because your cat will end up in a 12 hour sleep with no knowledge of what happened before it passed out
And sorry i missed the 2 weeks clean part, but if your cat gets the urge to relapse trust me a couple vallies does the trick first hand experienced