Hi there littleyank ime sorry your going through this its horrid .i would go with your sister and have a word with your dr i think they can test you and your sister to see if you have the gene but even if you did it dosnt mean you may get it . But your dr will advise you and arrange for tests if he thinks you need them but try not to worry you know most of the time we waste so much of our time worrying about lots of things that never happen .just dont smoke and drink eat healthy . As these are the biggest causes rather than genetic  ime sure a lady will come along and give you better support and advice than i .best wishs to you  .paul ps on here theres an ask the nurse .also theres the mc.millan and maricurie helplines you can get number off the net its free just ring tell them about your concerns and they will advise you and your sister what help you can get etc etc they are lovely to talk to and talking to a human being will realy help .