Hi, arimomma, welcome to SI. I am so sorry you are dealing with this nightmare in your life!
Have you read the articles in The Healing Library in the upper left-hand corner? They will help you to understand how to process your life being turned upside down.
There are also some great articles for newbies in this Just Found Out forum, scroll down and find the ones with the target icon on the left-hand side.
Only you know how much you can tolerate...keep in mind there is never room for two in a marriage, from your post it sounds as though your husband is a repeat cheater? Is he willing to go to counseling?
The best thing you can do for yourself right now is take care of you and your daughter. Be good to yourself. Get out of the house to get your mind off of the affairs, go for long walks, stop at a coffee shop, meet friends, walk the mall...anything to keep you busy and at the same time you will be spending quality time with your daughter.