You are not alone in being a worrier, I thought I was the worlds worst. In the past I have found  lumps ( five times in all) and thankfully they all turned out to be cysts. Last year I had almost 12 months of tests and scans because they thought they had found 'something' in my spine, again it turned out to be nothing to worry about. So, try to think positive, hopefully it will all turn out well for you too.
Ann x