Cool - I dont know your Vlogs, but why would you not pass. Voice is a biggie though - besides face and maybe boobs the most important gender marker people will notice right away.
I am not suprised at his diagnosis - hehe, I seem to develop an "ear" for that, especially the vocal fra was quite obvious and the breaks as well. The tremor seems to be something all transwomen have, at least according to Dr Kim. Unless you are a singer who has learned very good control of the voice maybe.
I read up a bit on that issue and also his diagnosis. It is "Spasmodic dysphonia" or "focal laryngeal dystonia" - check out
http://en.wikipedia.org/wiki/Spasmodic_dysphonia for an overview. There are more medical pages on thsi like
http://www.dystonia.org.uk/index.php/professional-research/types-of-dystonia/laryngeal-dystoniaSevere cases sound awful, the voices sound squeezed and break all the time. So if this is comparable we seem to have in common to have a mild form of this. Treatment with Botox is advised by the professionals on this , but they also have surgeries where they cut nerves or muscles to reduce the tension and tremor. In severe cases the botox has to be repeated ever 3-4 months.
It is described as a neurological condition.
Now my GUESS is that Dr Kim believes that this issue in our cases is caused by a misuse of the voice, a mismatch between what the brain wants and what the larynx does and what the brain is used to do and what it tries to do - all of this seems to cause issues. So his approach seems to be to treat the symptoms of this for a while - 3-4 months with botox and then again the same time with medication and meanwhile have the surgery heal and the brain adapt to the new voice that should now take less effort to match, so less tension, less mismatch and so on. What he said to me was that the brain should learn how to use the new voice within some months, with vocal exercises and botox in effect, and then also the tremor should subside.
In his therapy, botox is used only 1 or 2 times plus some time on medication. I guess this is possible because it is only a mild form, the severe forms of this dystonia seem not to go away like that.
Oh and yes - misusing the voice, overusing it, forcing or pushing it to something it is not naturally can cause phlegm and neck pain and all kinds of stuff. I had that too, voice therapy helped a bit, my hope is that now after the VFS I will be able to speak relaxed and thus not strain my voice to use the pitch I would like to use.