Hello,
For anyone interested, I came across the Wim Hof method (had heard about it a long time ago). It is said to train the autonomic nervous system. People have said it has helped with stress/depression/immune system/pain/inflammatory conditions, as it brings down inflammation. It is very easy breathwork and also taking cold showers. The breathwork can be a standalone, as can be the showers. The protocol is said to help one cope better with physical/mental adversity as well. I myself don't have PD (family member does; they are not so open to alternative therapies). But I've started the Classic 10-week course for my general health and it does something. It seems it can help with PD too.
livingflow.net/reversing-pa...
Here's a free tutorial from Wim Hof on YouTube: youtube.com/watch?v=nzCaZQq...
And a breath timer (a copy of Wim Hof's app): youtube.com/watch?v=_q9MSWk...
Best wishes to all.