I know this isn't the advice you want to hear, but if this has been continuing for a time then it's a problem. If only for your own piece of mind I would go to your doctor and just explain what's wrong. That will feel awkward, yes, and so will an exam to check things out, but hey, the doctor will have seen this kind of things a million times before and won't think a thing of it. The problem is just in our head when we face these difficulties. But this is your health we're talking about and you don't want to take a chance with that.
Nobody living can ever stop me
As I go walking my freedom highway.
Nobody living can make me turn back:
This land was made for you and me. (Woody Guthrie)