I'm not a doctor. I'm just about finished with nursing school.
Drug seekers are a big problem in the ER. One of the hospitals I worked in actually had to put a sign on the ER doors that said "Narcotic-Free Zone". They come in claiming to be "allergic" to all kinds of milder medications and make non-specific complaints about generalized pain, and often know the doctors by name. They are called "frequent fliers" by the hospital staff.
As for myself, I have some sympathy for these patients because I believe they actually ARE in pain. Chronic use of opioids supposedly ruins existing opioid receptors and causes new pain pathways to develop, so that non-painful stimuli can cause pain. I try to be patient, but my limit is reached when there is an actual emergency with another patient. Also, I don't like it when the addicts follow me down the hallways, pulling their IV poles behind them, begging for medication because the 2 hours they have to wait between doses is 5 minutes away. I really hate it when I have more than one of those patients assigned to me at one time. Last week, I had 3. They are so exhausting.