I am 12 and 4, this has been going on for about 5 days. Throughout the night I wake up with a heavy chest--feels like something heavy is stepping on it. Feels like I almost can't get a deep enough breath in, but yet isn't my lungs. Anyway, I wake up with this feeling and it lasts a little while but gets better throughout the day. Has anyone else had this? I am SO uncomfortable! Thanks in advance for any feedback.