geordie ,many threads on Body and Soul confuse me and this is one of them .
You have two concerns, firstly the result of your faecal test and secondly the abdominal pain that you have had since November.
In you case, I cannot see how the results of the faecal test is of any value. If the result comes back positive it doesnt mean that you have cancer and if it comes back negative it doesn't mean that you don't have cancer and in all likelihood it is very unlikely that you do have malignant disease , so dont place an great deal on your faecal test.
You main concern is your left sided abdominal pain which seems to be food related. This also doesnt smack of cancer, more probably of Diverticulitis which if continues may require a camera up the rectum and colon.
As to the other answers......AA and Aortic stenosis I am completely confused.