Come on Chrissy - don't be embarrassed about making excuses, just 'feel the fear and do it anyway'.
I'm the world's worst and having breezed in for a BUPA medical many years ago and almost keeling over with shock when a mass was found, I spent the entire Easter weekend prior to a hospital biopsy actually sobbing and pleading with God, life, anybody that it wasn't going to be anything awful. I've never been so scared. Results of the procedure showed it to be a fibroadenoma, and harmless, but I couldn't have known it was there. I hugged the Surgeon when he told me and he said he knew that it would be o.k. but just couldn't tell me that without the proper tests.
I have regular Mammograms. Very different here in France, you are sent your invitation, you choose from a huge list of local hospitals, women's clinics, special breast clinics etc., make an appointment yourself and then turn up clutching your previous scans and results. These invitations are sent out every 2 years. Mammogram, then films are inspected, then ultrasound, then examination, then Doctor reviews results, compares with old scans and notes, then comes out to announce (hopefully) all o.k. Your scans are still sent on to a large organisation who again review all the results and then write to you with your latest scans and you keep all for the next time. So, a double check, but no real waiting or anxiety.
Do the mammogram, do the colon cancer testing kit, turn up for anything that might prevent serious illness and help save your life. It's horrible that it creates so much anxiety, but so much better than the alternative !!!!!
Good luck and just look forward to a celebratory drink or slice of cake after you get the results.