My oncologist was just as caring and empathetic as yours! I wonder if we went to the same one! I, too, worry all the time and wonder if any twinge is cancer coming back to a new place. I asked my oncologist how I could check and she said I couldn't. So I just take a nurofen and hope.
I think everyone secretly fears the return but we have to learn to push that fear to the back of our minds. I try to think positively and if the doubt pops its head up I think of something I love, like my grand-babies, which aren't babies any more, even though I keep telling them to stop growing!
You are definitely not alone,
Lynne