Sorry to hear that your FIL phoning gave you a major wobble.
I think we do so well when we are in control of our emotions. When something comes along unexpectedly it knocks our feet from under us and all the raw emotion comes flooding back.
You sound stronger again. The good thing is the longer we do this the less time is spent on our knees after being knocked over and the quicker we are able to get back to being detached from the dance.