I have been experiencing chest tightness and chest pressure since winter of 2019. I feel as if I am breathing through a very narrow passage and there is something heavy on my chest. The tightness has increased in last 3 months. At night, all these symptoms worsen. I get short of breath. I feel as if something is pushing against my chest and blocking the passage. I try to yawn to get more air, but there is some obstruction that doesn't let the air in. I'm also perpetually tired and sleepy. Even after sleeping, I yawn excessively to get longer breaths. Last night, I was coughing hard so that I could push the air inside. I felt very anxious and breathless. Kindly suggest a solution for this problem.