Hi there, I have been having some similar struggles. I can recal the memories and often have vivid nightmares but during the day when I am awake and conscious I am not able to visualize the experiences/images. EMDR has been recommended but I am nervous about it because I know a large portion of that treatment modality is visualizing. I am wondering if you ever ended up trying EMDR and what your experience was like.
This was so interesting and I found that I was able to relate to your experience a lot! I also have PTSD and while I am unfortunately able to "see" everything again during nightmares I cannot visualize things consciously when I am awade. EMDR (eye movement desensitization reprocessing) therapy has been recommended to me but I am nervous as I know it involves a lot of visualization. I want to try it and hope that it will work but am afraid that my experience will be similar to yours with GMI. I hope it is validating for you to know that this isn't because you aren't trying hard enough or that there is something wrong with you. Our brains just work differently. I also find it interesting that you got a degree in photography. I love photography and feel like it is so important to capture the moment because I can't go back to it visually later on. I wonder if this is a common theme for people with aphantasia.
I was actually just wondering this yesterday. I recently found out I have aphantasia and yesterday I was listening to a podcast about psychedelic assisted therapy and I was wondering how that would work for someone with aphantasia!