I am 23 years old female, 2 years back out of a family problem, my brother happened to slap me, and I started crying, and had breathing trouble, palpitation, and my hand and legs became numb, and whole body nerves were stiff for some time, after sometime, it got back to normal, but I was very exhausted, and my body was paining. This again happened last year, but no such incidents happened, but all of sudden, the same kind of thing happened. Why is this happening?