Diagnosing psychiatric illnesses is anything but an exact science. Unfortunately, there's no blood test or scan they can do that, if positive, they can definitively say you have bipolar, ADD, etc. Well, not yet anyway...scientists are working on that.

In the meantime, the doctors muddle through and we keep searching for answers as to why we don't feel well.

I think the best thing for you to do is ask your psychiatrists why they think you may have a personality disorder. They should be able to give you the specific symptoms and traits that they see that would lead them to that diagnosis. If there's something that you think you may have left out or not explained as well as you would have liked, let them know. It may take some time, but it sounds like you're on track to getting things sorted out.