My Mother was put on warfarin after her stroke and has completely...

My Mother was put on warfarin after her stroke and has completely deteriorated. Her mood was quite good and her energy was ok but now she looks really ill. Very lethargic, very depressed and talks of death all the time. We keep telling the Doctor at the hospital that this change occurred with the introduction of warfarin. He says it is not the warfarin. She also itches her head all the time. It is so distressing to see her in this state when she was doing so well before. I wonder if a high dose of soluble asprin would be a solution - even if not as good as warfarin, she may get herself back.