Hi, for a few months now I've been experiencing breathlessness. This isn't just normal breathlessness, it mostly occurs while I'm sedentary, like just sitting down or laying in bed. I feel as if, even though I'm breathing in, I can't get a full breath of air, or as if the air I'm breathing in just isn't sufficient. At first I thought it was due to my diet and lack of exercise, but recently, due to high cholesterol levels at the doctor's office, I've been exercising much more and eating well. Somehow, I'm still having these issues with breathing. Some other symptoms I've noticed are that I've also been really much more emotional that usual, and my hair has been falling out more as well. Could this be a thyroid issue? I've spoken to my doctor a few times and haven't reached any solutions. I'm a 20 year old healthy female and I'm really concerned about this, so any advice would really help! Thanks!