Sharing with supporters and others about triggers can have the effect of realizing them. This realization can temporarily give more power to the trigger. Now you've outed the trigger, it is more challenging to cope by using self-deception or numbing to hide it from your conscious mind.
This seems normal as a phase of processing. Next comes "processing" or taking away the trigger's power. Effective trauma therapy can help.
I have found use of strong smell, like just VICKS in/under my nose, will stop a trigger emotional flooding attack within seconds. My T. said Eucalyptus or peppermint, strong pungent smells, tell the brain, you are here (grounding) NOT back there.
Some of us have processed traumatic memories on our own or with support. I don't recommend the DIY approach, unless it's "first aid." If you do get triggered and go fully into the memory (feel like you are "in it" in a way, you can access the part of your mind that still knows it's just a memory. Then "present-time, adult you" can console the part of you that is trapped back during the traumatic memory.) Frankly, it's really hard to explain. Someone else put it simply as literally giving yourself a hug. You complete the memory experience with a positive ending, which is all your brain really cares about, endings. That can, sometimes, "complete the incomplete" action, or loop, and end the trigger and recurring flashback.
For me, the flashback or trigger will happen more and more until I extinguish the fire it causes in my body and mind. Also, for me, I had to turn and face the memory, no matter how hard that felt, and figure out what was the negative core belief or what I wanted that didn't happen (incomplete action). Usually these fragments/parts are waiting for something they didn't do or receive.
It could be you thought someone would come to comfort you (attachment cry) so you cry and cry and are feeling like someone should be coming, but you feel abandoned. In this case, you save yourself, hug yourself, and comfort yourself, to complete the action. To really complete it, telling a safe supporter or T. what you did helps you realize you have completed the action.
There are predictable incomplete actions based on action systems (attachment and defense, or FFF: fight/flight/freeze are the two survival action systems that trump the others and give rise to large reactions in our body-mind). Other actions systems, such as play, explore, eat, sleep, get disorganized or co-opted by the survival actions systems' incomplete actions.
Sorry to get so technical here. This is actually a very brief summary. These are just some theories you can use if you like in therapy. I actually learned them AFTER having to do trauma memory processing on myself when I went through recurring flashbacks to various traumatic moments I was re-living, mostly at night at home.
The other issue with PTSD is that the majority of flashbacks happen at home or random places, not in therapy. I guess EMDR might be a more controlled way of accessing the incomplete actions and completing them in the office setting.
Hope some of my post helps! I'm having trouble with coherence and focus today.