That sometimes happens with me and it also feels like emotional self harm. It is like we are trapped there and unable to do anything but experience the "abuse". I have made some progress with it lately, sometimes an older nurturing child part is able to come out and turn it off. I love it when that happens! A couple of times she has come forward and turned it off as part of taking care of ourselves and it really does feel so much better.
Having said that last night I started binge watching a Netflix show called "________" (I can't remember) about a woman who but appears to have some PTSD and dissociaitive amnesia. Throughout the program she has flashbacks to childhood and other trauma.
Yes it very triggering, no we can't stop watching it (until 4am). Hey, maybe that is why i am so triggered today?!

I used to do it a lot. Sometimes as self harm, but sometimes as a way to "face" what happened too. It was as much a way of me working through things as it was me "hurting myself" - it depended upon the amount it showed n how much I allowed myself to see at a time.