It was pretty nightmarish, but I'm still very thankful I received it. 40 minutes of awfulness in exchange for years of not needing glasses/contact lenses was worth it for me.
Also, I'm guessing this issue isn't too uncommon, because during my consultation a week or so before the procedure, they mentioned that they could give a small dose of a benzodiazepine (I think Valium) beforehand to reduce anxiety. When it was time for the procedure, I think they mentioned it again before it started but they said it didn't seem like I needed it, since I don't think I was showing outward signs of anxiety at that point, and I didn't express (or have) any conscious fears. I think there's a good chance that if I had taken it, all of the trouble could've been avoided.
So, if you make those concerns known and request one, I think you'll likely have a much better experience than I did.
Also, I'm guessing this issue isn't too uncommon, because during my consultation a week or so before the procedure, they mentioned that they could give a small dose of a benzodiazepine (I think Valium) beforehand to reduce anxiety. When it was time for the procedure, I think they mentioned it again before it started but they said it didn't seem like I needed it, since I don't think I was showing outward signs of anxiety at that point, and I didn't express (or have) any conscious fears. I think there's a good chance that if I had taken it, all of the trouble could've been avoided.
So, if you make those concerns known and request one, I think you'll likely have a much better experience than I did.