I'm sooo sorry you're going through this. Remember to breathe and not add any heavy stuff on your plate for the next few days. BY that I mean: Don't be around people that will be negative and send into another downward spiral.
I felt the same the day H moved out. Although he didn't leave with OW, I was so hurt because I had put a timeline on the separation and was sure we would reconcile before May of this year.
Spoil yourself rotten. I'm sending you many many warm fuzzies!
M 42 H 39 T10 (-2yrs separation) S8 D5 DD 7/30/11 (EA&PA) Reconciled 6/2013 Separation in works 1/2017