welcome, Seekserenity. I'm so sorry for all you've been through and can only imagine the hurt and disappointment you feel right now.
Then Pandora's box popped open!
How long have you been married? Can you share more about some of the incidents that led to this?
You're probably wise not to talk to your kids about what's going on, it can get tricky. You have a counselor and you have us now. We'll help in any way we can.
It can be so incredibly overwhelming to come to grips with what's happening. The grief hits you like a bus, especially when all you anticipated was happiness and security and love. I can say from experience that the intensity of the feeling will dissipate in time - it won't always feel this intense. You'll go through various stages of emotions. The one you're in was the hardest for me.
Write back when you can, read the other stories here, and know you are not alone.

pj