buprenorphine and tramadol both raise Norephedrine levels. While raising NE does help to combat pain, it can also make you sick if your NE levels are raised too much. In addition, as Alcie pointed out, you have to watch for seratonin syndrome as medications that increase NE also indirectly affect seratonin levels.
Tapentadol might be a good alternative IF taking the two pain meds together is too much. Its similiar to tramadol but about 2.5 times as potent. It can cause NE and SE related side effects BUT you might have the side effects less severely or not at all since you would be switching from 2 NE sources to 1. Tapentadol however is a schedule II (unlike buprenorphine which is a schedule III), but provided you use the medication you are one as prescribed, the doc should have no problem presribing it. Tapentadol is excellent for nuero pain, but just be aware its not as side effect free as first thought.
You could also vouche for being put on a low dose of hydromorphone extended release. This medication has little effect on SE and NE, so its not quite as "geared" towards nuero pain. However, its a very potent Mu receptor narcotic and should help with the pain.
MRI revealed disc bulge and test injections revealed RA. Radio Freq procedures have decreased the severity of pain by about 1/3rd. Was on Nucynta (tapentadol 50mgs) for several months, but due to a decrease in pain, I now used Tylenol #3 with Codeine and .5 mg Klonopin. Go ahead and laugh but the Codeine works well ;)