Yesterday, I was just itchy on my leg and it wouldn't stop itching! Today, when I was in one of my classes, when I was trying to breathe, it hurt my back and it felt like if I took an even deeper breath my back would just break apart. I keep meaning to tell my parents, but when they're around I forget. Also today, out of the random I had a muscle pain on my right side. It went away. While I was running yesterday, not much happened. Just the itching. Today I'm also still itching on my stomach, leg, and other places too. What is it?