Thanks for your detailed and long reply. I'm not afraid as I no longer avoid speaking situations, I'm calm during them, and there are no signs of stress either before or after blocking. I'm not at all self conscious or phased when a block happens. I have a positive attitude about communication as I do not let blocking define who I am or get in the way of my life. I am certain I'm not blocking when alone as I talk to myself frequently and a lot. There aren't any words I can't say when alone. I'm certain about my fluent speech when on drugs as I can hold very long conversations and say everything I wish to say when on them, something which I can not do when sober. Others have also commented on the difference. I understand where you're coming from, but I'm trying to understand this block as much as possible then I can start working on trying to fix it. I have raised my awareness of what happens in my life, trying to figure out what helps. I'm doing this by keeping a diary of what happens in the day and when I block. edit- one thing I have noticed is that I'm very aware of how people are feeling and whether they are a good person or not. I know everyone has instincts but mine seem to be very aware.