yes, I have left shoulder nerve pain from PD, and have had diagnosed PD for 4 years now. All I can tell you is what works for me to keep it in check, and in my view is also slowing the progression of my PD. I have been taking it for 10 months now at app 600-900/mg per day with no AE. My neurologist is well aware I take it and in what dose, as it is not by prescription, and is currently being researched for its use as a treatment option for PD (although some very promising research has already been published on early this year). If you look back at my posts here, you can find a number of research posts to get you started. Suffice it to say that in addition to its PD application, it has applications to nerve pain through its sodium channel blocker properties, but for me it has to be taken in a sufficient dose to control it.
Many on this board now know what I am going to say, and you may as well - in a word - Ambroxol.
As always, do your own due diligence and very much hope and pray you find some relief!