Can't help you source meds here, other than by directing you to find a doctor.
You probably want to find a different doctor though.
If you have a heavy heroin tolerance/dependency 2mg buprenorphine/day is going to barely (if at all) cut it. At the very least you'd also want to have stuff like gabapentin, clonidine and diazepam, but even then having more buprenorphine to work with is much more ideal. The option of 8mg/day for seven days for someone with a serious habit is advisable.
But also, you'll need to make plans for supporting yourself post buprenorphine. A longer, extended detox of six months on buprenorphine (basically a long slow taper over six months instead of just using it at a steady dose for five-seven days) is often advisable for individuals with a serious habit. It gives the patient time to stabilize a bit in life, figure out more of an effective support network, etc.
Methadone is another alternative, but I'll let you let us know if you're prefer that.
It can take a lot of effort and exploration to find an effective recovery support network for you. Doesn't even need to rely extensively or exclusively on formal recovery communities (I for one didn't find 12 steps very helpful, but I did find secular mindfulness communities very helpful), just a network of people/communities that you can draw support from while you transition away from opioid use IRL.
Here is a good place to start looking for options with buprenorphine prescribers in the US. At the very least, you'll want to get a second (and/or third) opinion:
http://www.samhsa.gov/medication-as...cian-program-data/treatment-physician-locator
