Ever hurt yourself?

About a week ago I was taking my dirty clothes to laundry mat, so I washed my clothes and was taking the home in the car.
Anyway when I was trying to get out of the car I tried to lift the bag of clothes and I felt a pain in my left rib cage, I thought nothing of it.

Anyway the next day after having an afternoon nap before going to work I notice I have this 'hole' on the left side of my body under my rib cage.' And thus I have pulled a muscle in my rib cage.

Has anyone done something as lame as this, that has had a longer lasting effect than a couple of hours? I still have the problem at the moment but I hope it can heal but I don't know really.

P.S. I have consulted a medical professional :p