Back up to the OP, NO! don't tell a doctor you're addicted! I wouldn't have told Whitney or Anna Nicole Smith to admit to their messes, much less someone just using a bit more pain killer than prescribed. That will follow you forever as a 'drug addict' and if you got your leg blown off in 20 years, they'd give you tramadol. (You know tramafail will be around in 20 yrs.)
On your pain meds, start taking the oxy (whatever the source) as prescribed on your doctor's prescription, but use the last week of the prescription to taper down even more. If doc wants to know where you got the pills, say the PO brought them back. (PO won't hardly admit to it, and he's under investigation!) Say the Tramadol was shit and you were sure glad to get your prescribed pain pills back! Say they worked like a charm, then ask for a refill.
Benzos are harder, imo: no matter how many benzos you have now, use just the dose of benzo you were prescribed (possible hard weeks ahead, but your body will get used to it). Save the extras you bought for 'emergency times' when you want to have some more without cutting into your prescription. On your next refill, you can ask to have it filled ever week instead of every month—you're much less likely to overuse when your pill bottle is almost empty.
AND if you have a good relationship with the doctor at all, tell him that sometimes you need more benzo than the prescribed amount (especially with corrupt POs hounding you all the time), and that you curl up in a corner and deal with it but it hurts, and how an extra one every now and then would really be nice. They'll up your dose to your prescribed amount - [1 up], like instead of 3mg as needed, it'll be 3-4mg as needed (and you get 120 pills vs 90).
Feel sorry for you! Hope that PO gets what's coming to him! Good luck!