I am 23 years old male. I was smoking for 4 months in my life. I started having pain in my back which is like a stabbing pain. Then it increased to pain in my chest also. Though there is no fever but I feel a bit feverish. This is happening from last 3 months. I have become thin also. I am very tensed and i have consulted almost 3-4 doctors. I have done my full body checkup with Chest Xrays which came all normal. But I feel all is not well with my Body. Please help me out. Thanks in advance