Lan - You need to be the one with the agenda and plan when you talk this weekend. You need to show her some strength and leadership. Let her know that you have had it with her adulterous nature and you have your dignity to uphold. One thing that has worked for me in discussions is to ask the other person what they would do if they were in my shoes.
What is most important now is to get a handle on your high BP being aggravated by stress. It might be worth it to check with a doctor if there is something you can take (besides whiskey) to help calm the nerves.