DM,
I am so sorry you are here among us, but you found a great place, even somewhere you can come years later!
It is fine to be mad ... be as mad as you want!!! Throw things (not at anyone), scream, cry .... anything to let it out.
It will get better. This is usually the hardest time.
It is all about YOU making decisions for YOU. I am sorry your wife is having a hard time but this was HER choice and she brought every bit of this on HERSELF. She wants to have a nervous breakdown, that is HER nervous breakdown SHE has brought on herself. You dont need to save her right now. Let someone else do it, or better yet, let her take care of herself.
You might consider finding a hobby or something you used to enjoy that takes your mind away from things. I have horses and I rode as much I could drag myself off the couch. When I did I felt SO much better. Even if only for a few minutes. I suggest you find something .... workout, take pictures, join a club, work on your car/boat/motorcycle, run, read ...
Something else that really worked for me was journaling. I couldnt get enough time in the beginning! I went and bought different pens until I found the ones I liked the most, different colors, brands, types. It is very interesting to go back and read what I was going through ... and it helped me focus some of my anger also. Then sadness and moving on, or rebuilding.
About the RA .... remember your choices last FOREVER. If you go down that path you will be just like your WW .... a MadHatter ... and that is NOT COOL !!!!!!!!
If you cross that line, you have crossed it FOREVER
Right now it is about YOU. If you need time, you take it. If this is a dealbreaker, well, her loss. If you can R, then great but it is YOUR choice.
Take as much time as YOU need before you go home. SHE made the choices and if she is suffering, all the more for her to think about.
If you do go home and see if you can R it might be worth getting some MC. THere may be something in your marriage that needs adjusting (beyound you wifes ability to make decisions and have appropriate boundries!). I read a LOT of great books while I tried to R (my exH didnt really try, he made it looklike he did for the whole victim game he loves!) ... but I learned a TON about relationships, people, interacting with others and even how to read people in an effort to spot those who are lying to you .... best experience of my life!
If this is a dealbreaker, you will heal and move on and find someone even more wonderful! There are a WHOLE lot of people out there who DON'T cheat (even though sometimes it is hard to see :)).
I hope you feel better soon! Keep posting, there are lots of people here who feel your pain and understand exactly what you are going through!!