Spontaneously, My Middle Finger Started Pulling In Toward My Hand

Spontaneously, my middle finger started pulling in toward my hand and it feet like a cramp but my whole hand seemed to lock and it stayed like this for about 10 seconds. Three days later, my right hand did the same thing except it was worse because a strong pain radiated from my wrist midway up my forearm. Once I was able to move my fingers it was hard for me to grasp anything. I am fearful that this could be signs of a stroke. Can you tell me what this could be?