Wow! Let me just say you had quite a ride and sharing it is a great way to let it all out - something I know for a fact is very difficult for a man to do so kudos!
I believe seeking medical attention for depression should be a good think to think about at this stage just to be sure you will not get too overwhelmed with this life-changing challenge that is facing you now. I know it might sound like its too early or its something that you can just bear or maybe you might be afraid you will get dependent on any drug (if needed) to keep your senses at bay but believe me, it will do you more good than harm until such time you get to pick yourself up again.
I have been in such a situation and I consider the medical attention I got to be one of the main reasons I am still typing this right now.
Once you get yourself all sorted out, then you will be able to think more clearly and maybe you will understand or know better on what really happened that caused her to do such a thing.
Best of luck and hold on! This is something that will only make you stronger for sure.
