Thanks @Zoe7   I’ve given myself a headache from clenching my jaw, if I don’t clench my teeth will chatter. 

I get this vision on and off, and I used to be able to push it out of my head, but today it is there all the time.  The vision isn’t even of the worst thing that happened to me - but it is of something that has always left me feeling very frightened.  It was terrifying at the time and even now it feels the same.