Hello I share your concern. Knot in upper back an be sebaceous cyst or Lipoma for this particular purpose you can consult a general surgeon in your own time. Breathing problem with phlegm and night sweats, these findings is consistent with tuberculosis, long cancer or lung abscess I would like to know your age and any history of weight loss or smoking or exposure to occupational hazards You should immediately consult your GP for a battery of tests like blood for hemoglobin, CBC , ESR liver function test sputum culture and microscopy and a CT scan chest if need be Steam inhalation and deep breathing exercises will definitely help you Have multivitamin supplements Thanks and regards