Perhaps its because of faith and love that you have in yr marriage? The vows that you made when you married him? We know that we ought to take care of each other no matter what happens be it poor, rich or any sickness that strikes. It is easier said than done but needs strong determination.. Life is not always a bed of roses but Im sure you will be able to survive through this period, it just takes time. I myself also went through certain "critical" period but I survived! I think it makes me a much stronger person in character. So do stay positive!