In general my experience is I'm always severely undermedicated for pain. About 10 years ago I was in hospital for acute pancreatitis. Anyone of you who've had that knows how ridiculously painful this condition is. They basically wanted to fob me off with some paracetamol. I could hear a nurse and the attendant physician arguing about me in the corridor and he kept going 'we can't give him morphine, he's an addict!'
... which I found ridiculous for two reasons. One, with the massive tolerance I had at the time, it's not like a standard therapeutic dose would get me high ; and second, what exactly did they think they were gonna prevent from happening by not giving me any? That I'd like it just a bit too much? I was like, y'know that metaphorical horse has already bolted and disappeared over the horizon quite a while ago.
Plus an astonishing number of medical staff seem to be ignorant of the fact that opiate-dependent patients have a LOWER pain threshold so require MORE by way of analgesia. I had to argue with 3 different docs to finally get my morphine, and pretty much had to graphically point out that come next morning they'd have to be doing A LOT of cleaning up after me if I wasn't to be given any. It was infuriating.
And yeah I've been met with a lot of prejudice from GPs. The most annoying thing is that once it's known you're a user, whatever complaint you come in with is gonna be chalked up to the fact you're a user, which can have severe repercussions if as a consequence you won't receive proper diagnosis and treatment for an array of physical and mental health problems.
The shittiest attitude however I've generally encountered from pharmacists for whatever reason. I've had them refuse to fill my script, act like they couldn't find it even though I'd been to the surgery to check and they told me they'd definitely sent it down, been made to wait while 10 people who came in after me got served first, snide remarks made about me in front of all the other customers etc etc.