BPD is such a hard diagnosis to pin down, i think. it can be a bad day, a bad habit, or a bad life that brings out those symptoms,,, or it can be a brain chemistry disorder.... and the people who have it seem to be the last to notice ~

here is the link to the Quiz mentioned by Peg, it's more of a check-list, really. take a look if you have time, and see if you recognize yourself~
best wishes~

http://psychcentral.com/lib/symptoms...sorder/0001063