So sorry you are here but you have found the best place where there are lots of people who can help you.
Please read the Healing Library here and there are also some good books like "Not Just Friends", by Shirley Glass and "How to Help your Spouse Heal From Your Affair" for your husband.
Best advice I received when I first came to SI was that I didn't have to make any life changing decisions right away ....that I should take a year to think things through and I'm glad I did because healing from infidelity is a roller coaster ride.
Take good care of yourself, eat, drink water and sleep. Know that there is nothing you did to cause your H to cheat and keep posting. There are many here who can help you.