You do have a valid point. Having an addiction problem does come back to haunt you. But, I feel the if you are honest with you doctor, he will trust you more. If you hold back, I think the consiquenses might be higher then if you did tell him.
I say tell the truth and tell him how long you have been clean and sober, meetings, support groups, family intervention etc. It will help he have some trust in you.
Nevertheless, this is going to be a hard nut to crack. You have to understand that you do stand a big chance of not getting a narcotic pain med from anywhere. Doc's are already very timid about giving them out much less to someone who has an addiction problem. To easy to get back into trouble again.