Hey! I also get Botox injections around my jaw and neck every 3 months and that helps to slow down the movements. I get the injections from my neurologist. Most insurance covers the cost or most of the cost because it is medical and not cosmetic.
I'm getting botox injected into the muscles to partly paralyse them. I get the injections every third month. Earlier I used an antipsychotic containing pimozide. That worked well too, but gave me fatigue. There is also an antipsychotic containing haloperidol you can use. I haven't tried that one.