Bowel cancer?

Hi my name is Andy. 
I'm 47 and have just had a positive fit test after noticing blood in my stools. I'm over weight suffering with stomach pain and lower back pain. I'm tired constantly and nauseous most of the time. I have lost two stone in as many months. My blood tests have come back normal and I have a colonoscopy planned within the next two weeks. I guess I'm here because I'm scared. Just hoping to find some support before hopefully all tests come back clear.