I may be wrong here, but I think the fact that you stay with her is because somewhere in there, you do love her deeply. And you know that these bad behaviors are due to an illness, something she can't really seem to control on her own.

I'm not sure that seperation or divorce would really be the answer here. Not to guilt you, but it would likely make her condition worse - MUCH worse - before it got better.

Get her into treatment. Maybe even inpatient-style treatment for a week or so. Do NOT leave her alone with your kids - find a babysitter or family friend to stick around for a while. Maybe tell your wife they are just there to help out around the house for a while, you don't have to tell her that they are there to stop her from hurting herself or her kids.

If you didn't love her, you would have left her long ago. You've made it this far....don't give up. What she really needs is someone to help her realize that she needs help, and she needs it now.

Also talk to her therapists and doctors to ask what you can do to help. Ask them how to limit her internet usage without being too extreme. Ask them for advice on how to show a little "tough love" to help her realize what she's doing...but not push her over the edge by doing so.

There are also support groups for family members of those with mental illness. You may want to look into that, for yourself, and your kids. A 13 year old could be deeply effected by this kind of situation.

In the end, if you've done everything you can do and she still can't or will not change - then perhaps divorce is the answer. Try to get custody of your kids. Maybe try to put some kind of "clause" into the divorce proceedings that she can't see her kids unless she is mentally stable and undergoing treatment. That may motivate her.

And I just want to say I'm really sorry that you have to deal with this. I am sorry that there are women out there like your wife...and like me. Right now, I'm somewhat sane. But I have been just as bad as your wife, in the past. It kills me to realize what I put my husband thru. Luckily my daughter is still too young to understand...but it also kills me to remember the nights I left her crying alone because I was too messed up to handle it. I hate what I've done to the people I love. That's the worst part. It's bad enough to ***** up my own life, but now I've gone and done it to people I love. But...that's why I'm going to see a shrink again, tonight. I've noticed things coming back again and I REFUSE to let myself get as bad as I was before. I have to stop it before it gets out of control again.