Lately i have felt really tired all the time. I can barely keep any food down. My chest has constantly been hurting. Can barely walk out of my house without being out of breath and getting really dizzy. Everytime i go to the ER they just give me medicine and say im fine. Its been going on for months. I also have a mediastinal mass thats not shown on xrays but they wont do another mri or cat scan due to them saying its non emergent.