My husband was prescribed scopoderm for drooling (they are primarily for travel sickness) and it had the most remarkable effect
He was able to speak, walk and eat really quite well after not being able to speak for over a year.
The effects wore off after a while and we then used 2 patches which are still giving him some help with his symptoms
I would recommend you all try them it's worth a go being as there is no other help available
Let me know if you have any joy