I work nights and on my nights I can sleep. 9 times out of 10 if I get a call I will wake up with a tight feeling in my chest. It s the weirdest feeling not like a pain but it does feel harder to breathe especially to take deeper breaths. When I try to take a deep breath it s like my lungs can t fill up fully and it just stops or feels like I m going to cough. Some times I will get woken up in my sleep randomly because my heart is beating so hard and so fast. (I also feel very sob and weird feeling in my chest) that usually lasts about 2 minutes. I m 21 and this has been happening for at least a year now . any suggestions???