Do you have your own GP or know a doctor you trust? A doctor who is understanding will work with you in a way to be sure you're comfortable with everything. For example, a doctor who knows you have dysphoria isn't going to immediately see you and say "Hop up on the table and let's take a look!"
What you're experiencing is a little concerning. I wouldn't want to even hazard a guess at what could be the issue because I neither want to potentially incorrectly assure you that nothing's wrong and I equally don't want to scare you. It's better to see a health professional anyway; google searching symptoms can often scare folks into thinking they have the worst possible diagnosis.
I'd say a good approach would be trying to find a doctor who is understanding of your concerns and your dysphoria and can act professionally as such. If you're not comfortable, don't feel pressured into doing or agreeing to anything you don't want to. If you want another doctor, request another doctor. Anything regarding this area is a sensitive subject, so doctors are actually already prepared for it being a touchy subject even before approaching the issue of the gender identity of the individual, so that may actually go in your favour with regards to how a doctor approaches his or her questions and examinations.
FTMDiaries makes a good point too, but if this happens to be something that you keep thinking about or is worrying you, sometimes it can better to just get it checked out, if only to put your mind at ease. Our brains can be real good at triggering fear when it comes to undiagnosed ailments.