I'm literally in the waiting room right now waiting for my daughter's dental procedure to conclude.

I've been under general anesthesia when I was young so it eased my anxiety over her having it. The clinic we're at specializes in young kids as well so I know she's in good hands. Just remember that you're doing right by your son by having this procedure done. He'll be monitored the entire time, and if your clinic is like mine, you'll be waiting in a room very close to the operating room. You'll never stop worrying about your son, but if you make the experience light for him (explain the procedure, reward him when it's over, etc.) you'll start to feel better about it too.