Low iron and Colonoscopy test, very worried.?

I have low iron haemoglobin and abnormal white blood cells means I am anaemic for last few years, I don’t much have symptoms except sometime my stomach get upset, endoscopy done which was fine now they want to do colonoscopy and I am very worried that what can be the worst? I am 32 Male, no blood in stool or any... show more I have low iron haemoglobin and abnormal white blood cells means I am anaemic for last few years, I don’t much have symptoms except sometime my stomach get upset, endoscopy done which was fine now they want to do colonoscopy and I am very worried that what can be the worst? I am 32 Male, no blood in stool or any weight loss even I am overweight really appreciate your views that what worst I should expect.
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