First things first, there are no magic cures for this stuff. Im back her again after I succesffuly DB'd about a year ago and got my W back.
Today is day 3 for me so I have been in a panic much like you.
Clearly your husband has issues that you cannot fix. Only he can. Oh.. and you can't tell him he's broken. He has to find that our for himself and then takes steps to fix himself.
The OW is your H's drug. She's like cocaine for him. He's addicted to her. His OW is broken too. Sooner or later, it will all come crashing down.
In the meantime, keep coming here to vent. I know how much pain you are in, I'm making myself sick from worry and depression.