I believe the main reason to file is because you want closure and are ready to move on with your life without her. I wouldn't do it as a tactic to try to get her back -- it's too expensive and when lawyers are involved it will be confrontational.
You should definitely do it if you're done but not before. As 2chiquitos points out it will not relieve your anger or sadness, in all likelihood it will make those worse. You need to work those through regardless of your marital state.
The other thing to remember is that nothing will change quickly here. You're looking for answers and resolution which is normal and very human, but you need to adjust your horizon because nothing will happen quickly. Let it float for a while and see how you feel.
Married 18, Together 20, Now Divorced M: 48, W: 50, D: 18, S: 16, D: 12 Bomb Dropped (EA, D): 7/13/11 Start Reconcile: 8/15/11 Bomb Dropped (EA, D): 5/1/2014 (Divorced) In a New Relationship: 3/2015
