Eh, they don't knock you out to alleviate pain, they do it because people have anxiety and are very nervous, and the thought of not being lucid during it is relaxing to those who hate dentists such as yourself. I've never had a problem with my dentist and they've told me I'm one of their calmest patients so they decided to keep me awake. If I were scared of the dentist, I probably would have been put under too. Can't say I blame you.