My mother switches mood so often its scary.

One moment shes laughing with me and the next shell start screaming at me. Maybe i just tick her off? One time (2 years back ig) when we were stiching clothes, i asked her if they could give my dress a little shape and she ended up choking me (squeezing my waist), saying "is this enough? is this tight enough for u?" and left the changing room. Ofc i started crying and after emerging out of the room she started being friendly again, a lot softer with her words. 

Weirdly, when it comes to her, i tend to get aggressive. Is this a byproduct of her own aggressiveness or is it just me making her agressive?