D..
B., I have no experience in this matter. I just want to tell you how sorry I am that you went through this and are still feeling the after affects of it.
The only thing I can think of that might be helpful is to work with a speech and language therapist who works with stroke victims specifically. Vanderbilt can give you some names. It's great that you've tried other avenues. Give the speech therapist a try.
All my best...