i had bowel cancer three years ago, it was a blood test that made them look, my iron level was at 3 which meant i was bleeding inside, it was a tumor in my bowel. my symptons were constant diarrhea, being sick and tiredness, first thought was ibs, i had a scan and they saw the tumor and then a colonoscopy to take a bit of the tumor for testing, i was very lucky that they cut it all away, half of my bowl left. i had cancer again last year but it was vulvar cancer and there is still dormant cancer in my body. please ask your doctor to send you for a cancer blood test and a scan. they test me every six months, the test tells them if i have cancer but not where it is. the second cancer i had did not show up as skin cancers does not come up on blood tests (according to the doctor), i hope you get the help you need, good luck and hugs.