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I wish we could help you more. My only other suggestions might be to try a pain clinic, or a specialist in pain control. Your neurologists should be able to recommend a good one.
This is a long shot, but you might want to ask your doctors about trying baclofen.
Here's a web site to explain it:
It will relax more than just your facial muscles though, but I know it has really helped people with spasms in other parts of their bodies.