Asthma :: Xray, CT Scan, Allergy, Blood Test, All Normal But Chest Problems Still Remain

I am a 21 year old female. I've been relatively healthy all my life except for being diagnosed with endometriosis when I was 15 and put on a continuous birth control. I do not smoke. Four month ago, right after I got back from my honeymoon, I started getting very tired and feeling super weak. I figured it was just because Carnival treated us so good and made me lazy! lol. However, this tiredness lasted for a week or more after we got back. So I took multiple pregnancy test and they all came back negative. Then I started experiencing trouble when I would walk up stairs or walk to the mailbox because my chest would hurt, I couldn't breath, and I would get dizzy and black out for a few seconds. However, I would never experience wheezing. Well I went to the doctor anyways because these symptoms were something I've never experienced before. The doctor did a chest x-ray, in office pregnancy test (came back negative) and blood test which came back normal. So the doctor came back and said I had asthma and sent me to a specialist. The specialist did a pft and determined that I had the lung function of emphysema because I showed definite signs of air trapping along with a spirometry which showed moderate obstruction. So they did a Alpha 1 test. That test came back negative. Therefore, they said they were still going to treat me as an asthma patient. I also went to an allergist who confirmed that I am not allergic to anything. I just don't know if I believe that I have asthma when these symptoms came on so sudden and when I've never had these issues before. Also, the symptoms have just gotten worse over these past four months. My breathing issues now happen even when I'm just talking to someone or lying down. The chest pain is associated on just one side, mainly all near my left breast. It is a sharp pain that on some days stay all day long and some days comes and goes to the point of crying out from the sudden pain. Additionally, Ive never had an asthma attack nor wheezing. The other day I had to miss school because I was experiencing nausea, nosebleeding, and chest pain. When I called the specialist they told me it wasn't a lung problem according to those current symptoms and sent me back to my physician. They physician did more blood work including a d-dimer, iron/anemia check, and did a ct scan which all came back normal. I am starting to get very frustrated because I don't understand why all this came on so sudden and why I'm having these issues when I don't smoke and I've never had these issues or family history before. Anyone have any suggestions I could mention to my doctor to check into? I'm so tired of spending all this money, even with insurance with no answer.