I have had very good results with NMR. It is not a quick fix and does take time and patience but it's worth the effort if you can find a good therapist. It's not impossible but you may have to dig a bit.
You might start by calling the physio therapy department in your local hospital and see if they have a direction to get you going.
Be sure to ask if the therapist has specific experience with BP patients and explains thouroughly thier methods so you can make an informed decision.
Take a look at the 'Useful Information' section for 'tips on physio therapy and facial re-training'.
Come back and let us know how you're doing.