I feel a tightness in my chest, as if something heavy is constantly pressing down on my chest. i feel like i have to breathe in deeply to het enough oxygen, but when i do so, i immediately want to cough. little phlegm is then excreted?

Time to see a doctor: Chest pressure, chest pain, or trouble breathing are signs that she should talk with her doctor right away or go to the ER. In adults, chest pain can be a heart problem. She should not drive herself (safer by ambulance). If it turns out not to be myocarditis, heart attack symptoms, or anxiety attack symptoms, the ER will also have checked for problems such as a collapsed lung or a pneumonia.