I watched the clock like a hawk when it came to pain meds, even setting an alarm on my phone. I learned with the first TKR not to let the pain get ahead of me. I'm glad your new nurse is more compassionate. I'm usually a mild-mannered person, but when it came to those pain meds, I could get nasty! They weren't the ones suffering, after all!
My second TKR, done about 3 weeks ago, had no drain tubes. I asked for it and got it! I had no problems at all. I had 2 with my first TKR. It was the same doc too. He said he was starting to do more and more without the tubes.