Go ahead and mourn.....go ahead and grieve.....
Find a quiet place and scream if you have to....or even if you don't....do it anyway.
Release that pent up excess negative energy.
Limit this to a set amount of time per day (mine was 15-20 minutes)
when your time limit is up....and thoughts and feelings start to creep in...you say "nope, my time for that today has past...must wait until tomorrow"
I call this the Scarlett O'hara approach....(LOL)
THEN......
Pull yourself up by the bootstraps and get on with helping
yourself.
You may not be getting from him what you need...but that DOES NOT mean you get to fall down on helping yourself.