Whenever people get angry (not necessarily at me) or shout etc I don't feel angry at them or scared of them or anything.

However, after prolonged periods of this, I apparently shut off. I have no recollection of what has passed during the time in which I seem to be unconscious (or whatever it is) and so far the longest I've been out is about 40 minutes as far as I can tell.

I literally just stop working. I asked my parents what had happened when I woke up the first time and they basically thought I was faking. I go rigid and uncommunicative, my breathing is deep but irregular and my eyes are open but fixed on something without blinking.

What can be causing this? I first thought it might be related to elevated stress levels or something but as I tend not to feel stressed or scared I'm not sure anymore.

Anyone else experienced it? And what might be causing it?