Cancer diagnosis after being told everything looked fine

Hi there, new to the group. I have suffered with stomach pains, bloatedness when I ate and then started losing weight. Went to docs who said it was either IBS or my endo so suggested going on pill, I did not want the pill and knew it wasnt that but had tests and scans for endo etc. I also told him my father and two aunties had bowel cancer but he said nothing to that. Blood tests were found to be severely anaemic to which I said I had been for years but kept getting given iron tablets. Anyway forward on to another doctor who I spoke to and asked but why are you anaemic to which I said ive never had anyone find a cause so i dont know, he asked me if there was any bowel cancer and i said yes, he said i needed a FIT test. FIT was 66 so was called back in to which I was told not to worry loads of people have positive tests and are fine. Colonoscopy scheduled for two weeks and found 6 polyps, removed 5 and left one which was 40mm still nothing really said, big one removed two weeks later and noted no cancer evidence. Forward four weeks and i am being taken into a room being told they found cancer……so shocked! Had my CT the following day which was a week ago, MDT team met yesterday then called me to clinic which is Friday this week. Just cant believe it thought i was going to have a panic attack when she said it wasnt good news, no idea whats going to happen but even if its clear I want a resection now I just do not trust the ‘everythings fine’ anymore and the slim chance of cells being missed will always haunt me. Has anyone had a similair experience at all, they said my margins were clear but she also said microscopic cells can be missed. Can i request a resection for my peace of mind? Ive got a massive family history of cancer also. Thanks