I have asked doctors why not just do a full scan to rule out any cancer. Their answer has been scans turn up all sorts of quirks we have in our bodies and then they have to investigate it with further testing and its usually nothing and is very expensive so unless you have constant pain or some part of your body isn't working properly, its best to let sleeping dogs lie. I have survived for 7 years post treatment now so I am doing pretty good. I do see a psychologist (she deserves a medal for putting up with me) regularly where I can down load all my frustrations and worries and she gives helpful links to what ever I need in life.
Just be happy you are off the merrygoround of treatment and do your best to get back to some normalcy in life. It's the little things will bring you joy. One of my best was when my nails could finally open a ring pull can. Another was when I actually needed a hair cut again.
