I've been having breathing problems for the past couple of years. My doctor said it's bronchitis, but I'm really worried because when I try to inhale, sometimes it feels like the air just doesn't reach my lungs. I have to try four or five times to get a full breath, and lately, I've been feeling a mild chest pain along with a cough and this uncomfortable pressure in my chest that makes me anxious. It even makes my body feel cold. Could you please tell me what's going on and what kind of treatment I should look into?