I think the bottom line is that you should go see a doctor. If it is cancer, doing some cleanses may not really work. Rather than work yourself up and fuel the Depression and anxiety, see a doctor and seek aggressive cancer treatments.
I think that seeing a counselor would really help you as you are going through a very difficult time and it appears that you are in a depressive cycle and cannot see a positive way out.
People love and care about you, so please do take care of yourself. Things like Breast Cancer can definitely be treated, but for issues pertaining to life, I wouldn't take the advice on a random message board.
I have a friend who has been battling cancer for a while as well. You can get through this, but you have to have your mind right and have the right cancer treatments and emotional support.