To help with freezing of gait, have the PDP carry a lazer pointer and when he/she freezes point the laser a few feet in front of them. It's like a target to walk towards. Before buying a laser pointer, try same with a flashlight. The PDP person can point the laser or you can for them. My YouTube playlist and channel cover many other topics including swallowing, with video examples:
https://www.youtube.com/playlist?list=PLA6OMZ8dRKTgUHVjwALkvdwreFfuc1CkW
I also explain which color laser is best for daytime, night, and indoors.

I was diagnosed of Parkinson's disease following a neurological examination and other series of tests, my symptoms first appeared in February 2014 tremor in both limbs, rigid muscle, impaired posture.. all medication prescribed were not working and i sadly took off from my job, being a single mother with two kids it was almost a hopeless situation. In September 2016, i read about NewLife herbal clinic in a health forum, this herbal clinic have successful parkinson's disease herbal treatment and treatment for other list of terminal diseases, i contacted the herbal clinic via their website and purchased the parkinson's disease herbal remedy. I received the parkinson's disease herbal remedy via courier and immediately commenced usage. I used the remedy for 7 weeks, all my symptoms including tremor gradually dissapeared till i almost forgot i had the disease, i have started working again. Parkinson's disease is not a death sentence, don't die believing there is no cure, its a final breakthrough for all living with parkinson's disease