Plenty of people with aphantasia have PTSD (myself included) as you don’t need to have visual flashbacks to qualify as a diagnosis. I have emotional flashbacks as one of countless symptoms. I have no idea what memory I’m in, or what is happening. It’s completely debilitating. Having aphantasia actually makes it much harder to heal from PTSD because almost all therapeutic modalities targeting trauma require sensory memory recall or imagination– EMDR, Rapid Eye, Brainspotting, Somatic Experiencing, IFS, psychedelics assisted therapy (ketamine, psilocybin, MDMA, ayahuasca, peyote, ibogaine, etc. etc.)
Aphantasia was originally hypothesized to lessen the risk of PTSD, but this was proven false in a very large study. https://www.nature.com/articles/s41598-020-65705-7
Here is someone’s personal account they wrote about it (though they do have other senses, vs me I am a total aphantastic) https://themighty.com/topic/post-traumatic-stress-disorder-ptsd/post-traumatic-stress-disorder-ptsd-flashback-aphantasia/
Here is a thread on reddit. https://www.reddit.com/r/Aphantasia/comments/7zkzbh/ptsd_and_aphantasia/
I wrote a multi page story about this and how aphantasia limits our treatments, and submitted to the aphantasia network several months ago, but I never heard back.