Ok, so you are the first thread I read now that I moved to piecing. I don't really know your history but I have seen your name around for awhile.
About the only thing I can say to you right now is to be glad to get to work on the REAL issues of your marriage, i.e. the anger, etc. This is truly a blessing because many people never get that chance once things get to the point our marriages got to.
Just from the few posts I have read from you, I know you will do just fine with this trip. Just remember, you can't control the situation and in the end, it will have to be your H's sense of "right" and his love for you that guides him, not fear of you finding out or some other negative feeling. Again, from the little I know of him and your sitch, I think he's at the point where that's going to happen.