I am so very sorry. Please do not try to soften your heartbreak or reaction. Your life has just been blown up. This is going to be very difficult and long process. Please go to YouTube and search "Jake Porter", watch his videos. Trust me, they will help you.
Don't go to see a normal therapist. You must find a Betryal Trauma Therapist, they are really trained to help you go through the process properly.
Another thing that helped me, the book called "Betrayal Bind" by Michelle Mays. Your husband needs to read "How To Help Your Spouse Heal From Your Affair" by Linda MacDonald.
I know what you are feeling. Many hear do. It is unexplainable unless you have gone through it. Hang in there. This trauma literally has affected your brain on a biological level It will take time to heal, but you will heal.
As far as restoration of marriage, much depends on your husband. He must truly pursue making amends. He has lots of work to do. Very important, HE CANNOT BE AVOIDANT. He needs to talk to you whenever you want, as much as you want, and he must be 100% honest.
How did you find out?
Know you are enough. You are precious. It was NOT you. He did a great evil to you.