Ik... I know it's my intercostal muscles, but that's it, I just want to know some home cures that I probably won't have to move far to get :/
You should seriously see a doctor because there really isn't any "home cures" for something that's internal. I don't know what kind of Hospital Closes for 12 hours? (they should be open 24/7) but regardless get your butt to an ermgamcy room or call 911 why would you come here? Especially on forums ?
It sounds like indigestion which is nothing. I used to have it a lot and it hurt more when I breathed in. But it shouldn't last long, if it's lasting a long time then it could be serious. Don't take my word for it though, I am no doctor.