Marriages are difficult and about 50% of them fail for a variety of reasons. It is not the end of the world, and in time, you will find happiness again.
The most important consideration right now is the children. You can seperate in a way that minimally damages the children. Research shows that children from divorced families will thrive as well as children from married families, where the children have maximum contact with each parent, and where there is an amicable and cooperative parenting plan.
I recommend this book:
Does Wednesday Mean Mom's House or Dad's - Parenting Together While Living Apart
http://www.amazon.ca/Wednesday-House...1&sr=1-2-fkmr2
If at all possible, you should try to resolve parenting, support and property issues by agreement (instead of litigation). Try mediation and collaborative family law first.
http://www.collaborativelaw.ca/links.php
Try marriage counselling, if it is not too late. You both should feel like you gave it your best shot.
Do something nice for yourself - ex. Las Vegas.