Scared or freaked out? That is an understatement in my opinion. I haven't felt that level of anxiety other then mushrooms...and I still might say the DMT anxiety was more intense.
I don't think really think I am concious...when I breakthrough I always have to look around where I was sitting for my pipe, because I usually just drop it. I don't think I could ever walk around on it. I have had "visuals" that lasted around 30-40 minutes in my most intense trance, although that is just a rough estimate. The clock said an hour, but I must have started a little later or something.
I only opened my eyes during a breakthrough once, and my room was completely illuminated. No light was on, or could be seen when I was sober, but when I opened my eyes during a trance I could see every detail in my room. It was awesome, but I closed my eyes quickly again to really see things. :D