i am going thru the same case....
the rules...
- be calm. never show anger. always be smart and wise on what you say to your wife. never abuse her - verbally or physically.
- install CCTV cameras asap in ur house. IR camera wid highest quality sound recording mic's. use a minimum 1 TB Hard disk.... as you may need recordings of longer durations. use best quality camera of a reputed company...few bucks saved wont help much............
- keep saving all recordings in a separate hard disk...and keep it as safe as possible.
- when ur wife fights wid u....u keep calm..... then keep the recordings safe of the trauma u going through.
After few months , you will see u have enough material to prove the trauma and also to safeguard yourself from any false allegations she might put on u... As she wud know that there are cameras, she would also stay calm and stop fighting with u....on petty issues....
rest..... use spycams.....they are very helpful !!! trust these are tried and tested ideas..............