There's this expression that I've heard from certain individuals during times of grief that came to mind regarding your looking for reassurance and being told everything is going to be ok.

It was something along the lines of "I'm not going to lie to you and tell you everything is going to be ok, because everything is not ok. There's going to be good days and some really dark and sad days. It's going to hurt. I will tell you, that you'll survive. That's what survivors do. And some day, you'll realize that the pain is less intense. And that you did survive."