Please help, I'm 14 and I'm afraid I'm going to die. Crampy sore pain I'm left arm?...?

I don't think you are going to die. You are too young to have a heart attack, so I wouldn't worry about that. I am 17 and I'm also very afraid I may die. I have also had some tests done and they say I am fine... but I am weak all over and get terrible shooting pains everywhere. Be glad you are still getting your period.. that is a sign of health. I am no longer getting my period. I advise you to drink lots and lots of water and start taking a multivitamin. Magnesium is good for stress levels and it helps your heart. Also, take a lot of vitamin C and try to exercise. Yogurts with active cultures are good for stomach and digestive issues. Try to relax. I know its hard. Make sure you get lots of sleep and hope for the best. You are young. You should bounce back sooner or later.