i have been sick for about three weeks,  bad cough to the point of passing out and severe sharp pain in the back of my head when coughing,  i am feeling a little better, but have been coughing up up green phlem,  and now it is a yellowish clear color and as a sour taste to it.
Thanks for your question on Chat Doctor. I can understand your concern. In my opinion you should immediately consult pulmonologist and get done 1. Clinical examination of respiratory system. 2. PUT(Pulmonary Function Test) 3. Chest x-ray. Your symptoms like cough with greenish, yellow expectoration, back pain, suggest possibility of pneumonia more. All these symptoms are also seen in bronchitis. So chest x-ray is needed to rule out pneumonia. If x-ray is normal then PFT is needed to rule out bronchitis. So consult pulmonologist and first diagnose yourself and then start appropriate treatment. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.