Has this happened to anyone before?

Umm well you could look and see if it's cancer if you haven't been tested please consider this and don't worry over this answer I'm not a professional. And also if you feel stressed before any of this then it could be panic attacks it's happened to me once .Also I hate to say but it could be really bad gas I hurt around my lungs if I have really bad gas. And remember just get tested for the first thing I said just in case don't think I said you have cancer because you probaly don't but you need to check.