Yes, I have felt like this.  I have 2 sisters older than me, and while I wouldn't exactly say that we are close,  I admit that on the 2 occasion I have tested positive for breast cancer, neither of them seemed overly concerned.  It isn't that I wanted them to collapse in to floods of tears and to make a big fuss over me, not at all, but I just got the feeling that they weren't too bothered, and I admit, it hurt me.  In fact, one of my cousins was more upset about my 2 bouts of cancer than they were.  In fairness to your sisters, perhaps they feel that because you  got the all clear, that this is the end of the matter, and there is nothing more to talk about on the subject.  Or maybe they are a little bit hurt that you didn't confide in them?  Do you think this is possible?   I am now at stage 4 cancer, and I haven't told either of my sisters how advanced my illness now is.  I have only told my husband.  I think that when we are stressed and going through a crisis, everything gets blown out of proportion.  What you are feeling at the moment is normal.