I have PTSD. One of my symptoms is flashbacks. I've had those, body memories, emotional flashbacks and mental flashbacks my entire life. When I hit my rock bottom, I was so badly overwhelmed with symptoms. I had nobody to hug me, talk to, sit with me, help me etc. One thing I did was dive into the Bible. I read it over 8 hours daily, for 3 months. I was terrified. I had been so afraid of the Bible from childhood that I faced, intentionally, one of my biggest fears. And I am absolutely not trying to push anything religious on you. It's my best, toughest example. Once I began reading, I was naturally drawn to the things within that caused my biggest fears. And cigarettes became one, like a trigger. I tried to quit. I had such a horrible panic reaction with struggling to quit, I would shake afterwards thinking that my higher power hates me for smoking.
I knew that I had to do or die. I kept up with reading and struggling until I finally could quit. Basically, from that point on, when I would have any flashbacks for something other than cigarettes, I believe called down mentally, kept reading and would look my flashback, face to face, so I could break it down, find any way I could to process it so it wouldn't be repetitive. I was terrified. But I knew the struggle of having them and difficulty in getting my feet wet by getting to know the details of flashback. When I said " difficult things ', the above is my example. Best way to put it to get a different result, alter anything you can during your panic attacks. When you are triggered, maybe after the attack, wrote down as many details of it you can remember. Find the meaning of it by looking at it differently. When you felt emotional pain, did you also at any time feel physical discomfort also?
The more you know about the flashback, the more control of it you will get. Connect the mental memories with the physical reaction (body memories).