Misdiagnosis???

Hello All. My dad has had PD for 19 years. We feel he might have been misdiagnosed by our step mother wants ot hear no part of that. I really wish I could upload my videos of him to get other assessment on his walking and very little shaking. THe standard care doctors say it's parkinsons and dementia and that's it. THey don't want to look into anything else. We feel like if he was misdiagnosed and on the medications that he did not have to be on that may have done the damage. Anyone know a location or somewhere I can upload videos to have someone give their thoughts? Anyone know of an "outside the box" thinking doctor I can inquire with?Thanks very much.