I wonder what "too aggressive" means when it comes to being a patient advocate and refusing to just let it go when someone under your care is in pain? Did you stalk the doctor down the hall and out to the parking lot? Smack him upside the head? Make threatening phone calls to his house at three in the morning? No, of course not..........therefore, you were not 'too aggressive', IMHO. Maybe you spoke to the MD in a less-than-respectful tone of voice, maybe you didn't bow and scrape---that's no excuse for his allowing his patient to go without adequate pain relief.
I'm all about diplomacy when asking an MD for something on behalf of a patient; generally, you catch more flies with honey than with vinegar, and I usually get what I want. But when diplomacy fails---and a patient suffers as a result---I have absolutely no problem with going around the physician, over him, behind him, or THROUGH him if need be.
Ya done good.