To start, i am a 15 year old girl. Ok so about two months ago, I noticed that I had leg pain in my right leg while running. It became unbearable to run, so I stopped, but my leg now hurts all the time ever since then. It almost feels like an ache in my thigh and knee. I went to the doctor for this and they said I messed up my leg running which I didn't believe. 2 months later, I am having more and worse symptoms. I have major shortness of breath, weakness in arms and legs and tightness in my legs and occasional tingling. I also have bad back pain, and occasional chest pain and ear aches. I was positive that it was osteosarcoma for the first month or so, and now I'm convinced its als. You can probabley tell I'm a worrier but I really think something is wrong with me. What do my symtpoms sound like to you?