House2 has posted on this twice: healthunlocked.com/cure-par... I have posted about it also. It you read this long article from Mar 2021 the main point I take away is that Caloric Vestibular Stimulation works: tandfonline.com/doi/full/10...
I am sure I can't get hold of the Caloric Vestibular Stimulation device, but maybe somebody knows how to get a Galvanic Vestibular Stimulation device?
Here are the videos House2 shared:
look around 36:00
This is offered in our area at a local chiropracter. It is generally not covered by health insurance. I think when I checked, patient would sign for a package, as with everything in PD advised it would take several sessions. I think the cost was about $3,000. Norman Doige wrote a great book on neuroplasticity. The Brain that Changes Itself available used and on Amazon.
Great book, there is a documentary on line
There is currently a trial underway at the University of Kent in Canterbury, England into Vestibular Stimulation. They have reported good results from their first trial (using Caloric devices) and I have recently taken part in a second trial using a different method of stimulation. I understand that the equipment used is only available for research purposes (in the UK at least) currently but they are looking to get it approved for therapeutic uses.
clinicaltrials.gov/ct2/show... this out. I know you can't get much info from this but as a caregiver to my mom w/Parkinson's and a clinical research professional, this is really exciting. Not another pill with more side effects.
I think this is the caloric vestibuler stimulation. This really helped in the first trial. Very exciting.
It doesn’t say whether it is Caloric or galvanic??? So, how would we know?
Scion NeuroStim is the sponsor. researchgate.net/figure/A-A...
Deep Brain Stimulation
Stimulating the ear can help PD??
Insomnia / sleep , anxiety, depression: stimulation devices and sleep monitoring tech 
foot stimulation is an effective (temporary) high
