Separating the Trigger from the Trauma

In my personal therapy, separating the trigger from the trauma is crucial. The trigger is just a catalyst. Without the volatile mix it is attached to, a trigger is benign. At worst, it just goes, "click" or sparkles for a while before its ashes get blown away in the softest of breezes. On an electronic trigger, the lights just go out. Alas, the chemistry analogy only goes so far. . . Ain't found the laboratory protocols which carry through to workable safety within the emotional landfill methane of my PTSD. Can't I just install a monitors and vents like they do in the newest "First World" landfills?
I am not yet certain if this is a newly emerging memory or a series of memories I have already worked through individually but yet to tie together into the complete story. Still separating the trauma from the trigger. My thoughts are still hopping like drizzle on an August baked roof.
The triggers seem to be leading to 2 of my 3 hard core alcoholic sisters. The third was just a baby during the period the memories seem to be leading to. One of the 2 sisters in this memory is 3 years older than I. The second is 1 1/2 years younger. Politically, they are as opposite as two family members can be. ?Opposite sides of the proverbial closet door?
One of my strictly personal, just-a-patient measure to when I am making progress is the calming. Typing this much has calmed me. It feels like time to back off and process. Small bytes and long chews. I have learned the hard way that emerging memories are fragile and extremely vulnerable to the power of suggestion. Working to be patient with the process.