You have to do what's right for YOU! If you have to pretend to be ill, do that. You could start seeing a mental health professional and tell the elders you have mental health issues "right now" and can't attend meetings because you can't focus or comprehend what they're saying. You have a wife, and she should be considered, but not to the point of forcing yourself to live an inauthentic life. Only you know what is right for yourself. I would hate to see you write that letter, whcih would be playing by their rules and not your own. I hope you don't have children.
Best wishes for a hasty and happy exit!