I Have Reason To Believe That I Have Ovarian Cancer.

I have reason to believe that I have ovarian cancer. Reasons for this is I have not had my menstrual cycle, I have been gaining weight, every time I eat my stomach burns and I can't eat the amount of food I used to. In both sides of my family someone has been diagnosed with cancer, my grandmother on my dad's side had lung cancer. On my mothers side my great-grandmother had breast cancer and my mother had ovarian cancer. I could really use some help. Thank you.