Hi Reikh and welcome! I am not familiar with outpatient treatment programs so can't help you there. I'm surprised your Dr would only help you if you got down to 6...that doesn't sound like a normal experience from what I've read.
The best thing is to get professional advice. Withdrawal can be very dangerous. I have read an anecdote of someone who tapered down prior to quitting but even with that approach its best with a Dr. Maybe a second opinion might be in order?