Hi Stargazer,
I'm so sorry to hear about your situation. I have developed terrible health anxiety recently and even walking into a Gp's surgery brings me out in a sweat, so I can totally relate to how you must be feeling.
18 months ago my husband went for a private MRI scan on his pelvis and spine to investigate intermittent nerve sensations down his leg. It wasn't really causing him that much of a problem but because it came up in an annual company health screening he agreed to get it checked out. He went for a scan and 24 hours later received a call from the orthopaedic consultant on a Saturday night - totally out of the blue - to say that his spine/pelvis was fine other than general wear and tear, BUT the reason for phoning was that a "potential abnormality in his bowel" had shown up on the scan and he was duty-bound to get it checked out, urgently. He was so apologetic for giving my husband this message, and at the weekend. We were both totally floored with this news out of the blue especially as he didn't have any symptoms.
Anyway after a very frantic month getting various tests arranged, both thinking the worst, it turned out that the "abnormality" was an "artefact", that is to say, an issue with the scan imaging showing a thicker than normal bowel lining and not a growth or tumour etc.
It was a horrible time.
What I'm trying to say, in a long-winded way is that:-
A) the doctors are being super-vigilant in getting any possible abnormalities they see checked put. This is a good thing because the sooner anything is identified (if there is anything) the sooner it can be treated.
B) Scans etc aren't always accurate at identifying anomalies so it could be nothing at all.
C) If any other tests (e.g. blood tests etc) aren't showing any issue it is a good thing
A friend of mine who recovered from bowel cancer and had terrible anxiety for follow up scans was told by her consultant to "deal with the facts". Although this is hard for those of us with health anxiety to do, it is excellent advice.
Reading everything you have said it sounds very unlikely that this is anything sinister and the doctor is just being very thorough.
This doesn't undermine how you are feeling. In your situation I would feel exactly the same as you but I just wanted to reach out to you. It's the unknown which is so scary. I hope you get positive clarification very soon. In the meantime sending you support and good wishes.