I dont have any history/or family history of heart disease or any abnormality, disease, or conditions. I am 18 years old, and dont smoke or do any kind of drugs. I workout for about 60-75 minutes a day, 4 times a week. My question/problem is this... about a week ago/for about the past week or so, i have been feeling like im not getting enough oxygen, i feel like i am unable to take deep enough breaths. I constantly try to force myself to yawn so i can feel like im getting a deep enough breath. For the past week or so i have also had a bit of troubles falling asleep/feeling tired. Im not sure if it has anything to do with this constant feeling that im getting enough air when i breath. What is causing this/whats wrong with me.