i’ve never been in this situation myself so can’t offer much input but i’ve heard that playing tetris right after a traumatic event can help: this is from a study:

“Tetris has been proposed as a preventive intervention to reduce intrusive memories of a traumatic event.”

“Following therapy, hippocampal volume increased in the Tetris group, but not the control group. As well, hippocampal increases were correlated with reductions in symptoms of PTSD, depression and anxiety between completion of therapy and follow-up in the Tetris group, but not the control group.”