Hi @outlander. Flashbacks after a traumatic situation can be very debilitating. For me they resulted in anxiety attacks where it felt like I was having a heart attack. I would wake up with rapid breathing, bathed in sweat. Sometimes they would strike during the day as well manifesting itself as a sudden feeling of dread but again with the pain in my chest. They have lessened and hopefully will disappear over time.
My therapist made these suggestions which I have found helpful. When they appear, see them for what they are - just thoughts and not reality. With regards to the visions of past experiences, she told me to veil them with a virtual coloured wash so I would distinguish that these things were not happening right now. A bit like when you see flashbacks in a movie and they are depicted in black and white or slightly blurred.
Often there are moments that would trigger my anxiety. It could be a scent, a sound, a song I hear on the radio, a news item on the media, something I see on TV. At those times, it's important to again distinguish that these things cannot harm me and that I am safe. It can get confusing so I try to ground myself - concentrate on my breathing, hug my dog, start counting or singing something, splash my face with cold water.
As for the future visions - I guess we just have to try to be optimistic. We can't do anything to change the past and the future hasn't yet happened. I try to live in the present, it's about all I can handle at the moment.