Gee, I only saw this thread because of a current 'like' notification, and I hope it's ok to re-surface it and add a little bit.
I think living within much stress for a long time, though never thinking of it as such until now, has helped me to recognize that, for me, stress itself become the trigger for 'traumatic stress', that is memories and stress related to past trauma(s)- terror versus fear, horror vs apprehension, etc. So that, not only does the regular stress make the stress cup overflow, but it triggers the recall (and definitely symptomology) of past traumas. (Which I never thought of as being described as 'traumatically stressful', but now I know that describes it very well). And I believe that (the stress, itself) increases my awareness to triggers, and decreases my resilience to prevent acting (out) on them, or ability to get or keep grounded. Then, my brain tries to pick up the pieces and tries to explain the feelings away in the present. But it's the stress, itself, which is the key. Like regular stress triggers traumatic stress (past). I have been trying to remain aware of it, to do stress-reducing things when I notice my mood is changing, or I recognize Ihave been triggered, (a full-time job!), but I swear to God it's the key within this, or as regards so many problems or reducing what PTSD complicates. Because then, all of a sudden it's like the cognitive thoughts (negative ones, or questons, the feeings and attempts to reason them), vanish.
Similar to triggers are embers under the stress cup, and stress is gasoline. Sometimes the triggers get fanned, and catch afire, but they are relatively easy to put out. But if the stress cup overflows, boom, all possible forms of fall-out. But, if I am able to counter (reduce the stress), and ignore negative thoughts/ questions/ fear/ mistrust etc bothering me long enough for the stress to receed, the questions (and likely behaviours- negativity, mistrust, fleeing, self-harm, etc) disappear.
And it doesn't have to be solely by avoidance or withdrawl but active ways to counter or reduce stress. And of course, for everyone stressors and stress-reducers are different.