Back pain neck pain, shoulder pain etc.

Hi doct, I have upper back pain in left side from 3 years, recently it got worsen and pain went to chest. I consult a doct they said its all related to cervical . I went for medication . I also went to neurologist he said its come from your neck .. i was doing some excercise. For some period of time i feel good. But from last 1 month i feel wierd symptoms like i feel chest tightness, feel pain when i touched the chest, breast, shoulder , upper chest. I also feel sometimes my breathe is heavy but sometime i feel.good. I also feel body sorness. Also having lightheaded and having weakness in body. My back and neck stiffness and cracking sound. Balance issue as well and issue in concentration. I also checked with cardiologist. My eco and stress test is normal. I am not able to understand whats happening in my body. Please suggest something. Is it related to nervous system or other disease.