The key question is: would you tell someone you love that they have BO or bad breath if you knew it was something they couldn't help? In other words, would you hurt their feelings without being able to offer a solution?
I've been told time and time again that it's all in my head. I agree to a certain extent that my issue might be psychosomatic. But I don't believe that I'm imagining my symptoms. I trust myself more than other people. If that's crazy; then I'm crazy.
If you have imagined your symptoms all of these years, you might need a shrink; but I think most of us have loved ones who don't want to hurt our feelings by telling us the truth.