I'm interested in suggestions/thoughts/advice regarding the idea of being thrown in a world that was once safe but now feels like a triggery minefield....I need to figure out a set of coping skills to endure this setback and handle painful memories or flashbacks as they come up.....
I think they fall into 2 categories - there are ways to distract, and there are ways to challenge. So first, try and be clear with yourself which you need, when.
If you've never tried breathing as a grounding technique, I'd suggest giving it a go. If you're a phone person, there are all sorts of apps - I use breathe to relax (B2R), it's pretty no-frills and just lets you pre-set a length of inhale and length of exhale, and gives a visual cue to follow that reinforces regulation. Counting for yourself can be a little tougher but also focuses your mind, if you are prone to racing thoughts.
When you need to distract from a stressor, the things you mentioned are good - being prepared with quotes to look at, load up some cute animal videos if that's your thing, pretty much whatever will engage you on something else. I depend on crossword puzzles for that. When applying grounding or distraction, it's helpful to assign yourself (in advance) a length of time. So, decide to breathe, or do a puzzle, or read quotes for somewhere between 5-10 minutes. After that time, evaluate if it's been working, or if you need to switch to a different technique.
If you have CBT skills, thought records are a great way to challenge thoughts and emotions that can hijack you. You can also find ways to create positive action in your life - your environment, community, part of the world. It could be political, or not - just finding ways to engage with the world that give you back positive self-worth, or where you can at least know that you did a thing that you believe is good - even if your self esteem isn't letting you recognize it - can also make a big difference.