i have read about this problem on a number of PD forums. Here are two responses I copied from others, hope they are helpful.
I found that this is a sign my meds needed increasing, only more sinemet seems to help. Amitryptiline at night low dose also helped me.
Sounds like neuropathy, which often has a burning sensation.Check out with your doctors, and get tested for blood sugar levels, and dietary deficiencies such as B12 etc., your doctor should be able to help but it is good to find the cause of this, as it may not be a PD symptom, and there are several PD symptoms that are common to other conditions.
As to a hospital bed, has your uncle been assessed by social services, thats how my friend got his, the OT did an at home assessment. I think you can self refer, check out the ocal council web site. And get the local PUK worker involved to advocate for him. Good luck.