Ive noticed that a lot of aspects of BPD - feeling empty, fearing abandonment, self-harm, suicidal ideation, reckless behavior, etc. - aren't exclusive to BPD and are found in other mental illnesses. Emotional volatility (just basically being an exposed nerve all the time) seems to be pretty unique to BPD though, and I can't really think of any other mental illnesses where this is a main symptom. I suppose someone could have behaviors like emotional dysregulation chalked up to just being a part of their personality, but if the emotional dysregulation was severe/damaging enough to that individual, there's a decent chance that they would also eventually be diagnosed with some mental illness; the likely (and it seems like only) culprit being BPD. 

Am I wrong on this? Are there other mental illnesses that mimic BPD in the way of these very heightened emotional states?  