The physcological effects of any cancer diagnosis can be as devastating as the physical implications.When you are undergoing treatment your mind is occupied with the practical aspects.When you are home and alone,all the fears will come flooding in and cause you great distress,as you become horribly aware of your own mortality and the implications for the peolple who love you.
That is perfectly normal,and if it becomes an insurmountable issue,you need to seek professional help from support groups and counsellors.
Knowing you are not alone in your feelings,and actually vocalising them with others will help gain some sense of perspective and control,as will posting for help and advice here.

good luck and good health

liz