"I didn't want to admit addiction to the doctor, because I would imagine they flag you, and if I ever have any serious medical issues that require pain management, I'd prefer to have that option available. Thoughts?"
Okay I have a thought! Okay, I don't know you at all so I'm not saying you're doing this. Many of us have these strings. We don't want to cut all strings (at least our drugs don't want us too). We sometimes don't realize that's what we're doing.
So, ask yourself "what is the right thing to do?" "What is the responsible thing to do?"
It's been my experience that doctors will just be more careful with you. Rightfully so, this is for your health benefit. A good doctor will not let you languish in pain. They will monitor you more carefully.
Remember "Rigorous Honesty"
All just my wee opinion!!