I have met two people with SD who get some temporary improvement with Klonopin (a benzodiazepine), but if it has made your voice completely normal for 10 years, then it is possible that your voice disorder is actually muscle tension dystonia (MTD) or something else, rather than spasmodic dysphonia (SD). If your doctors were so wrong about the allergic reaction, then it is also quite possible that they were also wrong about the diagnosis.A lot has changed in the diagnosis and treatment of SD during the past 14 years, so it might be worthwhile to be re-evaluated by an Otolaryngologist (ENT) doctor. The NSDA website has a list of healthcare referrals for medical professionals who have extensive experience diagnosing and treating SD patients.
If Klonopin (generic is clonazepam) really helps you that much, then I guess you gotta do what you gotta do, but it is a very addictive tranquilizer and the withdrawal symptoms are supposed to be among the worst of the benzodiazepine type drugs.
Stevie Nicks, former singer with Fleetwood Mac, has written extensively about her long-term addiction to Klonopin and her battle for recovery. http://www.benzo.org.uk/nicks.htm
Good luck.
Lori
AB/SD and VCD since 2003
Dallas, Texas