Hey guys, I could use some help/advice/insight here as I am kind of getting scared with whats started over the past week. About 5 days ago I woke up extremley short of breath, every breath was difficult and felt as if I could not get any oxygen. Chest tightness came along with this, and would be worse with deep breaths (if I could even get one). I went to the ER had a chest xray (negative), blood work (negative), EKG (negative) and blood pressure was 123/85 100% oxygen saturation. So after about 3 days the breathing gets slightly better on its own. A day later I start getting this cold sensation with every breath in my throat/nose (like breathing in air in extremley cold temperatures) I think theres something going on with my lungs here anyone have any ideas as to what it may be? I am 19 year old male who doesnt smoke/drink btw, THANKS!!!