If she was gone already, how would you be living each day? What would you be doing, what would your focus be on?
Try living like that now
That's the ticket.
If you can't do that, well OK. It's not easy acting "as if" she was gone.
But Bworl puts it well when he points out that doing something good for yourself, your business and your girls is worthwhile doing EVEN if you are honest about the pain.