You have done nothing wrong, the shame of it is they see the list you have and automatically say "Drug Abuser" and I see it everyday where I work.
It's really to bad people with legit chronic pain are always put in the drug abuser section, I get totally disgusted with it and have almost lost my job over saying so several times.
If you still have pain, go back to that clinic with your head up high and state why you are there and you want to be treated, it's your right and you also have the right to be treated with respect and if you feel like you are not, then tell them this is why I'm here, I know what medications I have taken in the past, I know what works and there is no need to explain to me what I have taken, I already know and in no way is that helping with the problem at hand.
Remember keep your head up high, it's not you it's our society, you deserve respectful treatment, like any person.
As for you Doc, I would explain to him/her the way you was treated and ask if he has a solution to this problem, ie: calling clinic explaining to them that you are under on going treatment for your medical problem and if you need to go in there here is a recommended treatment that he uses, they can attach that note to your file.
Goodluck and stay strong.