There is no one size fits all for how to help a person ground or recentre or find balance when completely overwhelmed by their trauma. Not in my experience.
I get really pi ssed off at my T when he, very occasionally in the beginning, rolled out the BS techniques that supposedly work. He no longer does. We are working on figuring out what suits me, some of which are the "usual" techniques.
I'm sorry you are struggling. What does help you in the moment Teacake? Figure that out and then make sure it is on record everywhere you go for help?
Take care.