Your self esteem, from which you are able to do things, takes a battering. Your emotions can become out of control, leaving you a wreck. Your life can begin to totally revolve around fertility, with your work and social system being severely impaired. Hopelessness is a non-state feeling. What you formerly believed in is simply negated to the stage that you can no longer cope.
Most people do cope.
I'm sure everyone has their own methods, which work well sometimes, and not so well at other times. Coping with stress is important. If you are unable to cope, then other aspects of life start to also stress you, from your work, your marriage, to simple things like driving your car. Also, although no direct relationship has been found between stress and infertility, it has been found that both male and female fertility may be lowered for some individuals who are suffering from stress. Hence, reduction of stress is important for you as a couple, and as individuals.