Lilfroggi1 - I really feel for you, I am trying to come to terms with my marriage ending (November) and I suspect there is someone else. I can relate to nearly everything you're saying, apart from in my case there are no children involved.
But your feelings of being overwhelmed and daunted, your confidence and self esteem being smashed as well as a sense of 'how did I get here?'.
I am having to cope with starting from scratch, job hunting (moving back to full time employed from part time self employed), that will then have to be followed by looking for a flat for myself (I can't afford to stay in my current home, but he can), starting divorce proceedings, starting the conversation about financial settlement, changing my Will, fear of things turning sour between us when money starts being discussed. All that as well as dealing with the strong emotions and sadness.
I will be honest and say I have at times thought I can't and don't want to go on. But there is a little voice somewhere in me that says there can be a new life and new love further down the line.
These forums show how horribly common this all is and reading them does help you realise you are not alone in going through it. They are also great for advice from those who have experienced it.
So I am sending you all my best wishes, I know it is utterly horrendous but as people keep saying to me, just look out for and after yourself now. I will keep popping onto your thread to see how you are getting on. I have had great advice on my thread if you would like to read it (my marriage has ended and my entire life has been taken away) Good luck X