Hmmm... Triggering memories - ranging from mild to relatively significant - daily pop up in my mind. I hesitate to call them real flashbacks. Often I react by releasing a short but loud scream. The memories then generally sink again, probably thanks to my meds.
Your memories, however, don't recede quickly. They take hold of your mind and emotions for...hours?
Have you discussed this with any professional?
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My dog

mastered the "fetch" command. He would communicate he wanted something, and I would fetch it.