But if the results are positive it sounds like you are already doing some positive things. Keeping a journal is a great idea! And reaching out to places like this is great also!
One of the things I've learned through all this is to be forgiving when friends/family react in certain ways. It can be really hard for our loved ones to know what to say. Try not to take your sisters response to mean she doesn't care. She could be in denial out of fear.
Anyway, if it turns out you do have cancer, please know you can do this. You will get a plan in place for treatment and things will move forward. Please keep us posted about your results! Love, Karen H.