My understanding is the 2 conditions often occur together. Everything you are describing could be BPD with or without bipolar. BPD on it's own causes mood swings that can be severe. Bipolar mood swings typically last awhile, not up and down within the same day. I don't know if you just have one or both conditions, probably best to see a doctor to figure that out because the treatment is different. Although I have seen pure BPD put on lamotrigine to stabilize mood, which is usually used just in bipolar, so I think there is a lot of overlap. I hope that helps