I'm a 33-year-old guy and I've been dealing with a cough for the past 20 days. Along with the cough, I'm noticing yellow-light green mucus. I've been using whey protein for about a month since I started working out at the gym, and I'm wondering if it might be the reason for my issues. I stopped using it three days ago, but the cough hasn't gone away. I also used to eat raw spinach and broccoli but I've quit those too. My cough tends to worsen when I'm lying down to sleep, and it feels like my chest really fills up with mucus, especially early in the morning. Can you help me figure out what's going on?

Tab azithromycin 500mg,orally,once daily for 3 days is advised to the patient.Rest continue all.