Theland are you sure you are getting all the financial benefits you're entitled to, first that springs to mind is is your wife claiming carers allowance for you. Don't know if CAB could help you or mind.
As for your GP you need to visit him again, maybe your drugs are no longer the best and most appropriate for you and ask to see different phychologist.
With regards to your move, although you cannot help out physically, you can give encouragement, make the tea, just thinking out loud.
But you will be far better of somewhere less cold and draughty which must be a positive.