Hurt on the job and told someone & didn’t take it serious

So I work at and I was picking up some stuff off the floor when a pile of boxes fell on me. It fell mostly on my head, my arm and my back. I was so shocked & embarrassed. I been working at the job for 3 months now and I don’t really know who to go to notify That a bunch of boxes fell on me. When I got up a girl did ask me if I was okay. I felt a little dizzy but I told her I’m okay. I looked at the time and it 10 mins until my shift is over. My back of my head started to hurt. As I was leaving I told one of the Team leads that my a bunch of boxes fell on me and he did not take me serious. He just cracked a joke. As I drove home and now I’m home the back of my head still hurts. I feel like it’s pounding. I can hear the pounding of my head on the side of my ears ( the boxes fell mostly on my right side)

I honestly don’t know what to do. Any advice what to do?