It is really a painful situation for anyone to seek to get his wife back in public forums like Internet but definitely not as painful as living without her.
Of all those whose wives have walked over them, at least some must have realized that the real cause for their present state of affairs is not the clash of egos that erupted on the spur of the moment but the exact opposite of it.
So much so, if you are desperately thinking of ways to "get my wife back" you should also be thinking about what best reconciles your wife so as to agree to come back.
She must also feel the urge to come back if any of your plans to work out.
Without that you don't stand a chance.
No matter how much hard you push at her, she can always think that you are doing it because you are desperate to get her back, which leads her to doubt your sincerity.
And as you go on pushing harder, it is increasingly harder for your wife to accept you back.
You know it as much as I know; there is no magic wand that by waving it and saying, "get my wife back" will do the trick.
Secondly, the task differs depending on whether it is leading to separation or divorce.
In any case, allow some buffer time for her to realize that she misses you before starting the groundwork.
This is actually when sensory mechanisms work at their own pace and make her realize that you are beginning to agree with her.
In the end, it is for your wife to decide what to do and it could turn out really against you but with a bit of luck, if you do your best, there is always a good chance that she'll see you as the best man she could have married and that actually it was her mistake to have walked over you.