Not sure what your medical condition is at this time, and I am hesitant to even suggest this, but quitting on your own is possible. There are tons of people who have done it (and tons who cannot do it). I just don't want you to give up just because you ran into one witch at the sub dr. IF and I mean IF you decide to try it alone, this forum is a WONDERFUL sourse of support and helpful information.
That being said, if I had to do it over again, I would go the sub route -only with my eyes WIDE open. I went cold turkey and while I don't suggest it as the easiest route, at least I didn't have to worry about getting of the
suboxone when the time came. That's why I suggest you do a lot of reading on this forum about people who have gotten on suboxone and not realized it's addictive qualities. IT IS A GREAT DRUG IF USED PROPERLY. Just don't stay on it too long and make sure your dr knows you want to use it for withdrawal only. (unless you have a pain management issue which is another whole discussion).
Robert can tell you more about sub than I can.