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Hi cjerome. Have your symptoms been present continuously for the entire month, or did you improve a few days and then relapse? Also, do you have any swollen glands or lymph nodes along the sides of your neck?
There are several considerations. One would be a sinus infection...one that did not completely clear with the amoxicillin (proper treatment often requires several weeks of antibiotics). Another would be a residual tracheobronchitis in which the original bronchitis clears but the damage and inflammation in the airway takes several weeks or months to clear completely. Another possibility would be allergic rhinosinusitis resulting in postnasal drip that is related to an ongoing exposure in your environment.
Further testing that might be helpful would be a sinus CT to look for infection in the sinuses and/or sputum cultures to look for infection in the chest.
No, this is not the way cancer presents. This is more consistent with infection or allergies. I would suggest you ask your doctor for a chest X-ray for added reassurance. If you were getting a sinus CT, you could ask that they include a chest CT as well.