I know you asked for prayers, not pop psychology, but I hope you are able to realise what a great job you've been doing these past eleven years. You have valiantly borne the cross you have been given and also shared in your husband's burden, most certainly lightening it.
Please don't be hard on yourself, if you sometimes find yourself doing just that. You are fighting the good fight!
May the Lord have mercy and help you turn this corner.