I'm afraid if I were Colin,,I'd be suffering from a guilty conscience every now and again knowing that I could/should have done more to help/support her. Like demanding the GP/Psychiatrist help,for the sake of the children,who must have witnessed their mothers' " mood swings ". I've no sympathy for anyone who disregards an illness as just " one of her turns ". Sheila loved Colin,,,bet he didn't reciprocate.It must have been a living Hell for her.