Wow...I know this is an old post, but I too have been diagnosed with HPD, and yes...I have been misdiagnosed over the years. In fact, it was I who initially thought I may have a cluster B disorder. At first, I thought I may have NPD but as I delved further it became apparent that I was not (the whole "empathy" thing...My wife tells me often that I care too much for others). Perhaps I was misdiagnosed because I am male and HPD doesn't often occur im men. IIRC it is something like 4% of those diagnosed are men.