sobbing uncontrollably to completely fine in seconds

this is something that happens very often for me. something can trigger me, or i’ve had the emotions built up and they come out. they come out overflowing, sometimes even leading to small panic attacks because i can’t handle the emotion. but then it’s just gone. like my tears are dry and i just feel complete apathy. almost disconnected. it’s like emotional whiplash. and honestly sometimes i appreciate it. but i feel like it’s causing me to stay in this same cycle. does anyone else experience this? i’m not so much looking for advice but just to know if this is normal for people with bpd.