Mark: Have you seen the doctor?
Dan: Yes, I was so stressed before the visit
Mark: But there was no reason to freak out
Dan: Rationally thinking there was no reason, but still
Mark: I don't really understand this exaggeration 
Dan: My mother died of it, so when he said there is a hint of suspicion I was petrified
Mark: oh, I see, I had no idea your mother died of it, I am sorry
Dan: I know, I didn't explain
Mark: No, you didn't
Dan: But exactly for this reason - I didn't want to make even bigger drama
Mark: Sure!
Dan: But everything turned out to be fine
Mark: Yes, but all the waiting brought so many bad emotions and memories.
Dan: Now I can imagine!
Mark: Anyway, he told me I should do the examination periodically, because of the history of my family
Dan: Anybody else had this type of cancer in your family?
Mark: The scary thing is, that in my mother's family almost everybody had it
Dan: Damn
Mark: Exactly!
Dan: But if you control it, everything should be fine. Don't worry too much
Mark: I won't, thanks
Dan: ;)
Dan saw the doctor because he suspected cancer and his mother died of it. He should do regular check-ups.