Hi,
I had the exact same thing when I went for my initial class 1. Was of course worried sick-had more tests with my GP-urine, blood and an ultrasound. The urine tests showed a slight trace of blood, but nothing was actually found. I felt fine, apart from a little paranoid as I had convinced myself that it must be something serious. After the tests, my GP wrote to the CAA to tell them I had jumped through the hoops and I was issued my class 1-with much relief!
It appears to be quite common. I work at a flying school and two instructors who teach there had the same problem. So try not to stress yourself out. I know it's very worrying when you're waiting around for results. I was particularly worried about having to have an endoscopy-luckily my GP didn't think it necessary!
Good luck anyway!
