I can understand your anxiety about this, wisdom teeth removal really is a scary thing but I can assure you that it won't be near as bad as your anxiety is telling you. I had all 4 removed few years ago and didn't even have medication or laughing gas for it. The longest part was the waiting for the anesthetics to take effect and the rest was totally smooth. After just few minutes the doctor said we were done with 2 teeth and asked if I were ready to do the next two and I was so surprised because I thought he hadn't took out not even one tooth yet.
So imagining that you have medication and laughing gas, you really will be fine.
To calm yourself down - my dentist says that breathing in and counting to 3, then holding your breath and counting to 3, then breathing out and counting for 3 and again holding your breath and counting for 3 helps. When you are breathing like this it has an influence on the biochemistry of your body and it is not possible for panic to get developed. This works for me, but I prefer to count to 4.
I am sure there are a lot of happy wisdom teeth removal stories here on the forum that could help you gain some hope.
The idea with the sleeping mask might be a good one but I am very sure that as soon as you are under medication and gas you won't care much about what you see and what not

my experience was that I haven't seen much anyway because the way the dentist works includes angles that makes spotting things very difficult.
Wish you a good luck and let us know how you were doing and hopefully you have a lovely caring dentist that will keep talking to you and put you at ease.