@LibbyA .... When I started on AIs it was late 2017 and the recommendation at that time was 5 years on an AI. My understanding was that whether a person had required chemo or not, the standard for those with hormone positive breast cancer was just 5 years. The guidelines changed later (maybe around 2018) to those that had required chemo, then 10 years was the recommended time to stay on an AI.
All the best with the test results, and no wonder you are feeling a bit doubtful of decisions made to come off the breast cancer hormone treatment. You have a lot going on at present, and I understand the anxiety/scanxiety around test/scan times. Remember what @FLClover says..... we are superheroes.