I don't think anyone can accurately define the time line of a particular memory when it surfaces outside of the specific context. So, I don't think anyone can say if it's pre verbal or not. But, one thing I can say for sure is that this is a very difficult flashback to deal with. Definitely disturbing. Sorry you have to deal with it..but you, probably, have to ..

I don't know anything about possible reactions to emdr. Never had it done on me and never conducted it for anyone..