OK, here is the problem, I had come back from My P.E class and later on I felt pains in my chest.Then when i was going to bed and i laid on my back,left,and right it hurt my chest. so i looked online i found no answer that i was looking for, Then i sat down and laid my back agianst the couch and it feels normal. Why does my back make my chest hurt? Why does my chest hurt when i breathe? what should i do becuase i hope there is nothing serious??? I do have athsma but not as intense, and I have been getting a lot light headed when ever i get up. What does this mean?