Please be good to yourself. You will get through this. Remember you are not alone and sadly this sort of thing happens quite often. I recommend you start looking at your financial documents to make sure you know all your assets and debts. Find out what you should do to financially protect yourself. Document what has happened so you remember the details your DD has told you. You may want to consult with an attorney now to start getting things in order in case you decide to move forward with a divorce.
I suggest you remain as civil as possible to your DH. As angry as you may be you want to make things as smooth as possible. Don't add any fuel to the fire as it will increase any legal costs. Try to move all your energy into a positive direction for you and your DD. I'm sending you some positive thoughts.