As in many cases, my voice diorder was also misdiagnosed by several ENT and voice disorder specialists for a long time,though I had classic SD. I have found the following helpful,
1)Good sleep.
2)Physical rest.
3)Meditation
4)Avoid mental stress complete. Mental stress worsens problem dramatically.
5)Ibuprofen works for a few hrs(So I take it before going to work.Do not take it at home as chronic therapy may cause renal impairment).
6) Sedatives do work like Diazepam, Lorazepam and Alprazolam, but I am subjected to random urine drug screen at work, so I have not gone on them .
I have not tried Botox. The issue of breathiness to voice scares me,as I already have that and don't want to make it worse!
I have had Injection laryngoplasty. This did not help. Also tried bilateral medialization Laryngoplasty . This also did not work. Speech therapy did not help either.
Now I have learned to live with the problem, though it affects my job and morale tremendously.
I wish there is a pill that could control this problem !.