Yes, this has happened to me several times. The first time was with my first long term therapist, three months in. She asked a questioned that triggered me unexpectedly & I stood up,said something to her in a dissociated state and left, walking home 2 miles and leaving my car in her parking lot. Very disconcerting.

The second time was after she retired ( a year & a half in) & referred me to her partner. He left mid-session to answer a call from an insurance company, closing the door after him. All I remember is being anxious & agitated about the door being shut. I remember getting up & checking to see if he had door locked the door on me but apparently I ended up leaving & walking home. Very scary. These wet a few early incidents in my therapy that were disturbing but now understandable.

Now, I have times when things get "foggy" or hazy or time seems to extend outward in a weird way, but I'm able to recognize what's happening & often I can voice what's happening as it occurred. But that doesn't make it any less disturbing or unsettling. For me it is truly a "therapy" triggering thing because I have been able to function in a fast paced professional career without interruption pretty much all my life. I am very good at compartmentalizing, but in spite of that being a good thing for me professionally & financially it has been devastating for me personally & intimately. There are wounds no matter how we try to manage or cover up.