The main difference I noticed are in the mood swings. While both experience mood swings, BPD is a much more narrower mood range it swings. Mostly just anxiety, and anger. Triggers play a larger role for BPD. While a BP has a much wider range in their mood swings and can feel very elevated too. Basically BP can be all over the map. Another difference is BPD has mode swings because of triggers so they can happen any time and last for minutes to hours, rarely days. You could have both if abandonment issues are present, and you fall in the other criteria for BPD. So your pdoc could be right! I would ask him which he feels is more predominant in your case. Good luck to you!