Rodney, I second Scott's advice. You can interpret your wife's request as literally "wanting some space." You've been through a lot recently, and you probably don't realize how much you've put her through. The fact that she has stated her desire to get away so strongly may indicate just how strongly she feels attached to you.
So, don't lose heart, but do lighten up. Its time to put everything on the table. If you're serious about your marriage she's got to come first, that's the point on which I suspect she really wants reassurance. Tell her that she means more to you than your job, your parents, your Cubs, and anything else.
Mean it.
Wait for her to respond.
Again, Scott has a point: a counselor can referee the conversation and help you negotiate an equitable arrangement in which you can both live your lives, hopefully together, but if not, apart without killing each other in the process.
It is worth talking to a counselor by yourself, and even if you go in together there is a good chance he/she will want to have one-on-one sessions anyway.
Resist the temptation to react. Now is not the time for recrimination or accusation.
Be transparent: tell her that you're hurting, as in, "When you tell me you're leaving, it hurts like hell. What can I do?" I feel certain she is hurting too.
Just don't commit to a course of action until everyone's feelings have been processed.
Trust in the fact that a lot of people of lived and died on this earth and many of them have gone through experiences that are similar to yours. Even strong marriages have been tested by fire.
I pray you will both be stronger on the other side, and I truly hope you will be together.
Words don't mean much when your feelings overtake you, but I trust you will be able to find peace, and remain at peace.
