Jake, go ahead and start a new thread with your question. As for 'addicted 73', I have strong opinions from my own experiences with addiction and from what I see with patients.... opinions that you may resist hearing.
I would be very surprised if a person taking a couple hundred of OC per day could leave the addiction behind. And it IS addiction; I don't know how you got the pills but the street value of your use is over $200 per day, so you were either dealing or stretching your finances... either of which puts you in areas where you likely faced consequences, making the term 'opiate dependence' apt. You also mention that you did it even though you hated it, a state of affairs that suggests addiction.
Opiate addiction is a tough nut to crack. Methadone is another 'agonist', although it does have some interesting effects at a different opiate receptor besides the mu receptor that may reduce tolerance and withdrawal. There have been 'methadone clinics' to treat opiate dependence since about 1972; the goals with methadone maintenance are to first to satiate the addiction and prevent withdrawal, and second to push the tolerance so high that other opiates are not effective. Your tolerance is already above that level.
I have followed, helped, assisted, etc many addicts detox from many opiates. Methadone and fentanyl are the hardest, in my opinion; fentanyl for the intensity, and methadone for the chronicity; as eagle states, the withdrawal from methadone goes on for months in almost everyone. You can reduce the withdrawal by reducing the speed of the taper.
In my opinion, though, your problems will only be starting once you finish the taper and withdrawal. EVERY opiate addict wants desperately to stop! Most find that it is NOT the withdrawal that keeps them using, but rather something far more powerful, that occurs during good times as well as during bad times. I hope that you can stay away, but if you cannot I encourage you to seek treatment sooner rather than later.