thanks for your question i completely understand your issue brown spots in sputum , can be blood , consider consulting a pulmonologist who can request for a chest xray and a sputum afb smear and a sputum culture continue with the medications if you are a smoker quit it right now regarding bronchitis / chronic bronchitis / copd you need to talk to the pulmonologist about te inhaled drugs which are the main therapy for chronic bronchitis disscuss all these investigations and treatment modalities with your pulmonologist rather than a general physician , he can guide you better thanks feel free to ask more questions