@tank121,
Hey Tank
Yep, ditto Jes' thoughts there...
you need to get the kids into some sort of counselling, and fast - I believe they would be experiencing something similar to a bereavement - however, their mother is still around and the shock, anger and frustration inside them must be huge. How can they possibly understand? They can't. It's difficult for an adult to understand - so they can't possibly comprehend right now why their mother has left.
Go and talk to the school SENCO - there will be a Special Needs Coordinator in your school - they can make a referral to a counsellor (internal or external) from the school. The other route is going to your GP (doctor) and insisting the children are referred to some family counselling. You need to be honest and open with whom you are talking to - that can be very hard because it's admitting that your wife has left - but it's the only way for the schooldoctor/friends/family to know how badly your kids are hurting.
You need to make this a priority - however, saying that, I can completely understand that during this time, where you have not been able to get a grip on the situation, that you needed to take care of yourself and get yourself in a better place in your head. Now that you are more able to cope with everything, please do talk to the school/GP as soon as possible.
Do continue to take care of yourself Tank - try and get some normality into the kids lives - seeing their friends, inviting people over, routines.... I dunno... the activities that your kids usually do. They need to see that you are strong too and need your reassurance every day.
Please believe me tho, kids can be incredibly resilient - please don't think that it will always be this hard - of course, I can't say for sure about anything because I don't know your kids, but I work with kids and they are resilient little creatures. Get them into some kind of counselling asap.
Keep talking if you wish to - there's a lot of parents on the A2Kboard who can give you advice, keep talking, and you'll get some different perspectives.