Dear Sabu,
I'm in the same situation. I received my medical furtherance letter this morning. I'm worried too. Like Yolex said, I'm just hoping it's not very serious. I would assume If anything serious was diagnosed in the initial tests, our DMP would have let us know.
By the way, where did you have medicals? I had mine at the Bridge clinic Maidenhead. There's no fee for consultation but I've got to pay for the tests. The doctor I've seen earlier is not available for a couple of weeks so more misery.
I've been doing a bit of search on this. As I understand, whenever there's a remark they've no hesitation in issuing furtherance so it's very common to get one. Please be rest assured, they're just trying to make sure that we do not have any underlying medical condition. We've crossed so many hurdles and let's just believe this is the final one. Good luck!