Heel Turn, you wuss. just kidding.
Sounds like you had a rough time but it usually isn't that bad. I had one for the same reason as you and my wife had one done just last year. She needed nothing more than Ibuprofen (advil) for the pain and had no bruising or swelling. She said that it was more uncomfortable because of the plastic stent and the fact that you had to watch what you eat and can't brush well.
Sorry you had a bad experience but hopefully your post will scare more people. No one's ever happy when they visit a periodontist (gum guy).