Welcome to SI, ronoh. Very sorry you've had to find us here.
You've just experienced a severe trauma and shock. The emotional "rollercoaster" you've just boarded is going to last for quite a while, man. But! It does get easier with time and some serious self-care.
Eat. I lost 30 pounds in 3 months because I wasn't eating. Eventually, I started with small meals, forcing myself to eat. And I started eating healthier too, which meant eating less.
Drink Water. Your body's going to be in hyper-drive for a while. Stay hydrated! Drink lots of water!
Sleep. If you can't, try some OTC sleep aids or see your doctor.
Exercise. Even if you've never worked out a day in your life, get on a treadmill for 15 minutes tomorrow. Then 20 on Wed. Get back into shape. The endorphins are great and it just feels good overall.
Ending this affair is your first task, brother. It's good (very good) that her family knows, that she now has to face her parents with what she's done as well (can be powerful stuff). If the OM is married, inform his wife immediately. Affairs cannot survive in the light of day. There's a chance, of course, that she and the OM will take this deeper underground and she will remain in a "fog." With today's technology it's almost impossible to prevent contact, but if your WW truly wants to stay married to you, she will go to great lengths to be completely and utterly transparent in every single thing she does. In fact, demand this from her. In the meantime, continue to expose this affair to everyone concerned.
Now, get these two words out of your head: Forgiveness & Reconciliation. These two things you can worry about months or years from now, if you ever do at all.
In "The Healing Library" are dozens of excellent essays from SI veterans that are must reads for you. Look in the upper-left hand corner of this page, the yellow shaded area. In the Library is an "Articles" tab. "The Tactical Primer" is your first step.
http://www.survivinginfidelity.com/articles.asp
If this affair, this infidelity, a pure deal-breaker for you and there's no reason you can find to even consider staying married to her and trying to reconcile the marriage, then don't bother. However, if there's still a part of you that wants to give it a chance, you should know that it is possible, but it's not easy, the odds are against you, and there are still never any guarantees in this life.
I can't let the kids go through a divorce battle though, so I'm going to do whatever it takes to fight to stay together.
The kids don't factor into this, ronoh. Pretend for a moment that you're one of your children and ask whether or not you'd rather live with healthy, happy parents, who love each other or miserable parents who hate each other. I grew up with the latter, btw, and it sucked. More so, however, you have no control over whether or not you can reconcile your marriage. You can control what you do and that's it. You can't control your WAYWARD wife.
ronoh, the next few months are going to suck. Surviving infidelity is going to test you like nothing you've ever known before, but you will eventually find your strength and clarity will return. Detach from your wife, become extremely cold about watching her end this affair and maintain No Contact. Then watch and see what she does. If she can truly "get over" this affair, recognize it for the lies that it actually was, and start to accept full responsibility for her decisions, her choices and her actions, reconciliation might be possible.
There's no reason to decide this now. In fact, I'm pretty sure every state has a mandatory waiting period before a petition for divorce becomes final, anyway, so the "system" is perfectly content to let you change your mind. One of my biggest regrets of the past year is never having actually filed, even if just to convey to my fWW just how close I really came to divorcing her.
Focus on yourself for a while, ronoh. For a long while.
[This message edited by Unhinged at 10:21 PM, February 29th (Monday)]