Breast clinic referral really scared

Hi this is my first post, I'm looking for some reassurance as I'm feeling very anxious.

I've got my breast clinic appointment on Wednesday and it's all I can think about at the moment. I've searched the forum for similar symptoms to fine but can't find anything.

A couple of months ago I was checking my breasts and happen to notice that my right nipple was slightly bigger than the left, especially when erect. I have no other symptoms at all. I whet to the gp and she examined me and said she couldn't find anything sinister, so I was surprised to be referred.

I'm 48 and never been to a breast clinic. Has anyone else been referred for a similar issue?