I do agree with everyone who has commented about you seeing 7 Doctors and all coming up with the same diagnoses.........sounds like you do not have much to worry about in the Cancer department.
However, that being said it is not uncommon for a group of Doctors to be wrong as well. I am living proof of that. I was told by the Head and Neck team as well as my own GP that I was imagining the lump on the side of my neck.......it took me 6 months to convince them that I was not being over imaginative. Mind you it was not 7 Doctors but 4 was enough.
David