Suggest Treatment For Severe Chest Congestion

I started feeling tired 6 days ago on Saturday the 4th. On Sunday, it felt like I had sand under my eyelids. On Monday I had chest congestion, which got worse. I was not running fever. I have not been back to work since Monday and continue to wake up in the morning very congested, coughing and with a headache. The symptoms seem to improve during the day, then worsen again towards evening. I have been taking over the counter remedies for the congestion and and expectorant and low doses of acetaminophen as needed as I continue to rest and hydrate. My temperature upon awakening from a nap after lunch today was 99.6, which surprised me since my normal body temp tends to be lower than 98.6. I can t figure out if this is just a bad cold that is running its course or something more serious.