I hurt myself :(

I was trying to do a backflip when i was really high. I’ve never done it before, but there was a mat behind me so i just went ahead. But i landed on my back with my legs flipped over my head and I almost felt like I ripped my lungs or something. That was a week ago, i didn’t think it would still be here. Now when i take a deep breath, it hurts. But it’s not really the lungs. When i lift something heavy, it hurts. It’s right in the center, above my stomach and below the chest. What could it be that I hurt?

And the reason i’m not asking the doctor this is because the doctors in canada apparently need 2 weeks of preparation for an appointment. I freaking hate socialism. But that’s a whole other story.