Good morning MAAF, I"m really sorry to hear that you are going through a tough time at the moment, of what you say it sounds like your wife is suffering from some sort of dementia, I would suggest calling (Dementia UK - 0800 888 6678) they offer support to carers and i'm sure they will signpost you and your wife to some sort of specialist support.
Good luck MAAF I wish you well mate.