I am 15, and have been getting laser treatments since I was young, and I strongly reccomend them. They have done wonders for my PWS, and it is almost completely gone now. When I was younger, it hurt while the treatment it going on, but with new advancement in the technology of the lasers, I can barely feel it sometimes.
Also, do not feel guilty AT ALL. I'm so incredibly grateful that my parents started me on laser, because the results have been wonderful. The 5 minutes of pain has definitely been worth the result. Best of luck.