There's some overlap here with the therapy technique called EMDR (used to treat acute PTSD). Both EMDR and the Tetris study involve thinking about the traumatic event while experiencing bilateral stimulation.
Studies on bilateral stimulation look really promising as a tool to manage trauma:
Studies on bilateral stimulation look really promising as a tool to manage trauma:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5061320/ (note the before / after section)