If my neural pathway techniques in my videos work for slow movement there is a good chance my unfreeze technique in my book will help you. I also have technique for helping pass bowel which is another common problem.

My profile has links to my YouTube playlists and YouTube channel (free to subscribe) for other problems in mid-stage PD. I go off meds often, testing them too.

Check out Sarah King's video on freezing on You Tube under her
Invigorating Physical Therapy and Wellness site

If u freeze up have someone get a flashlight and point the beam of light a few feet in front of, even better is to use a laser pointing device. It should get u unfrozen This is a way to trick our neural pathway through the eyes. There are other non-visual ways.

I focus on breathing techniques. In through the nose out through the mouth. I freeze up for about a minute.

Look at my legs and make one dominant. Make that one go forward first and make it and extra large stride.