Hi meche, I too found a lump myself about 6 weeks ago, I kept prodding about at it etc but after going through a cycle realising it wasn't changing I decided to go to the doctors, I must admit, before I went to the docs I really wasn't too fussed and completely thought nothing of, bt to be honest since I've been, and been referred to the breast clinic next Thursday I have become petrified, so don't be alarmed if this happens, I can't think of anything else, from the minute I get up til when I go to bed its all that's on my mind.
I think it's only natural to feel worried, and like you say once you go to the doctors it's like admitting something might be wrong, but in my mind I thought, if I leave this and it turned into the worst possible outcome I would never forgive myself.
Please make an appointment with your GP, I'm trying to tell myself that 9 times out of 10 it's nothing etc, but if ever it turned out to be something sinister at least treatment can start etc.
Good luck with whatever you decide xxx