I'd recommend all of the above and if you are still struggling/finding it a bit tough, you might want to check out SLAA (sex and love addicts anonymous) at the same time regarding the obession with your ex wife - especially the stalking. I've known many AA people who struggle big time with this kind of stuff and there is just no need too.
That doesn't mean you replace AA with SLAA, or that you are a 'bad AA member' or don't have a 'good enough program in AA' it just means you seek help from both, just like you'd get a painter to paint your house, not a gardner but a gardner will take care of your garden.
You wouldn't be alone there with your expereince either.
Good luck.