Wisdom tooth removal

I have removed the 2 wisdom teeth in the upper and lower left side in the image. Today is day 15 after the removal. I am having pain something like sharp object is being rubbed when opening the mouth and chewing food. So i just checked and found that there is a hole in the gum and bone inside can be seen. Is it normal? Will it heal itself? And also should i remove the wisdom teeth on the left side or not?