I'm an 18 y/o girl, healthy, exercise regularly but have various infections in my mouth and bad teeth. This morning, I realized that I had a tightness/discomfort in my general chest area. It isn't a pain, but definitely tightness. I got a bit nervous and felt short of breath and like I couldn't breathe. It went away for a bit but it's been back for a few hours and I now have the tightness/discomfort in my upper back and neck as well. I told my mom and she literally just laughed at me and went back to sleep but I'm seriously worried that I'm having some kind of heart issue, and I know that the longer you leave it the more likely you are to die. I'm afraid to even sleep. As far as I'm concerned there's no way I could've pulled a muscle, I haven't worked out in two weeks and I did go in a pool the past two days but I wasn't swimming, just standing. Please help, do I go to the hospital even though it's midnight?!?!