Is This More Than a Cold? Suddenly!

The symptoms I'm experiencing have been present for about a week. Yesterday I thought I was getting better but it turns out I'm definitely not. I'm wondering if this is a cold I should ride out on my own or if it's a situation where I should see a doctor just in case it's something else. My main symptoms: - Dropping temperature (My regular temperature has always landed somewhere between 98.2° and 98.8°. It's been gradually dropping and right now it's at 96.6°.) - Feeling as though I'm choking / shortness of breath / feeling as though there's a weight on my chest - Headaches not caused by mucus buildup - Extreme fatigue - Chills and shaking - A mild rattle in my chest when I cough - An aching body as well as a sore throat that hurts when I cough and swallow or move my head and neck - Slight nasal dripping. Mucus is white - Symptoms which I thought were improving but started getting worse suddenly Thank you for taking your time to answer my concerns.