Can anyone here relate to this and/or knows what i'm describing.

I have difficulties when I'm in groups. It isn't social anxiety as it can be with work colleagues and friends, anyone really. I think it is over-stimulation but don't know if that is possible?...it is just I wonder if I'm very hypersensitive or something else so normal day to day interactions can be too overwhelming?

Basically what happens is that I will be in, say a meeting with work, and my mind seems to disappear and I can't concentrate at all. It feels as though I'm very far away or as though my brain has slowed to a ridiculous pace. It feels as though the neurons aren't firing anymore. I describe it as being submerged in white or static. It is a horrible feeling. Plus because I can't focus on anything and it feels unsettling I can't sit still and just want to get away and clear my head.

Generally I end up taking a pain killers because it feels like a headache (but its not a headache) and/or I end up cutting in the toilets. I think the reason I end up cutting is because it gives me something to focus on. It isn't 100% effective as I feel very detached whilst doing it and as though someone else is doing it to me, but of course I know it is me as I make the decision to do it.

I wish I knew why social situations make me zone out. It definately isn't anxiety, unless it is deeply hidden in my psyche! Could it be possible my brain isn't wired to handle too much stimulation all at once and thus goes into meltdown? I can't understand why group situation would cause depersonalisation or at least something that is similar to it. I'm not emotional in these situations...i don't think anyway. It is hard to tell sometimes!

Is there anyway to stop this happening because my crude and ineffective methods are only semi helpful once in the middle of it all. And I am finding it quite upsetting and embarrassing now.

Any advice or similar difficulties would be really helpful!

ps - i don't know if this is the right section to put this as i have no idea really what it is!