Pain Involved and Possible over Scarring with Fraxel Repair/Restore

I have a Fraxel Restore procedure scheduled at the only place in my area (Maine) that does it. They have only been doing it for 6 months. I'm concerned if there is pain involved with this procedure, since they only use a numbing gel and do not recommend any pain pills or anti anxiety meds for it. I have panic attacks anyway and take medication for it already (Klonopin). I also had an experience with a numbing spray (for a painless belly button piercing) which caused me to pass out once it reached my bloodstream. So the possibility of passing out is also a worry of mine. When I asked them about it, they said they have never experienced that. Since I am very concerned about the pain, I was told they would give me the strongest numbing cream which I read here is not very safe. I would also like to know, can Fraxel Restore/Repair cause over-scarring? I was wondering if anyone could help me with these concerns as I am about ready to back out of this after wanting it so badly for my acne scars. Thanks.