I would recommend trying the Botox again. There have been a lot of improvements over the past few years.For a list of the doctors and speech therapists who are very experienced in treating SD, go to the NSDA website at www.dysphonia.org (there's also a link at the top of this bulletin board), then click on the Healthcare Referrals link on the top menu.
Another thing that helps me is deep tissue massage with a massage therapist and circumlaryngeal massage, which is included in my speech therapy sessions.
Good luck!
Lori
AB/SD and VCD since 2003
Dallas, Texas