Yeah, a doctor can be wrong too you know though.
They mostly run from what sort of patients they've had before and still, training for 7 years won't prepare you for everything. You heard on the news about mistakes doctors make?
If you dont explain the problem completly, they might not get what you mean.
So go and see another doctor like Gincarlo says, or just go back and explain why you think the doctors explanation wasn't correct. Question them