Several ways I use to calm down:

1) Exercise - I bike, but walking does the same. I focus on "being here now" and just enjoy what I am doing/seeing/hearing/feeling etc....

2) I take several deep breaths. Enjoying the feeling. In through the nose out through the mouth.

3) Think/say to my self "Everything will be OK no matter what happens"

"What is best for my kids is best for me"
Amor Fati
Link to quotes: https://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=2879712