GMC,I also have PTSD and right now it is acting up a bit. Part of what makes dealing with triggers so difficult is determining what the trigger is exactly. In order for a survivor to begin to determine what is triggering them, they must listen to their body's sensations and responses.
Once you start listening to your body you will start unravelling the "trigger mystery". Then what ? In some cases, simply recognizing what the trigger was that caused a certain response, then discovering what past experience the trigger is correlating to will release the significance. That is called association defusing. Associating A: the trigger + B: the experience = C: realization and defusion of the trigger. This is especially true of non-prograqmmed trigger responses. For the majority of survivors, association with perhaps a little therapy around the recalled experience will end the significance and power of the trigger.
I hope this helps you,
Kitt