I was a carer for my Mum and know how hard that can be. Not the same as caring for a spouse I know.
From your first post it seems there is a problem with a PD drug...it is SO HARD watching a loved one deal with meds when they go wrong...or need updating...
As I read your post and I remembered how overwhelming it can all be.
Carers are in the background and it is tough.
Hope your wait for support /a change is not long
Take care and thinking of you,