hi, i have been short of breath and unable to take in more than a shallow breath due to it feeling very uncomfortable in my rib area. When i stand i feel as though i could be sick and my eyes black out for a few seconds. Also i have really bad stomach pains as if i am really hungry but im not. My toe nails have also gone black with no trauma over 1 week since i have felt this way. I am 20 years old, female, 5ft 6, and 9st 2lb. I don t have any other medical issues.