@Oldvatr Sorry to hear about the loss of your wife. My OH, John, has Parkinsons and dementia so I know first hand how hard it is on a daily basis. On 15th Aug he fell and dislocated his shoulder and he spent a week in hospital and they wouldn't let him get out of bed because his walking is bad. I am now trying to get him on his feet again.
My thoughts are with you too. We managed to get good care from the council Adult Services, and they arranged for a lot of the aids to help us care for her to be loaned to us. They were not able to provide physio for mobility issues, but she had good support from her mental health team, It is not an easy path to go down for any family, and it makes my diabetes and stroke issues a walk in the park (which I am still able to do)
Keep an eye in the press etc for news on the trials into Parkinsons and Dementia with Low Carb diet and also using diabetic meds. I am not going to do a Trump, but there is anecdotal evidence that these may be promising for both conditions. We did look into Deep Stimulus treatment but it is not done in the UK or Eurozone. Proton beam therapy is also being looked at in Poland.