pain in lungs and throat when exercising

I am a 22 year old female with a history of asthma since the age of two.  In December, I was treated for what my asthma doctor thought was pneumonia.  I was out of town, and was unable to make it to an appointment, so I did not have a chest X-ray or anything to verify this.  He called in Biaxin and prednisone to a pharmacy nearby until I made it back into town for an appointment.  I also have asthma, so the symptoms were really serious and my albuterol, both my inhaler and my nebulizer, were not working.  While taking Biaxin and prednisone, I did start to feel better, so when I went to see my asthma dactor after returning to town, I told him that everything seemed to be getting better.  As soon as I finished the ten day course of antibiotics, however, I began having difficulty breathing again.  I had chest x-rays and blood work done (CBC, Chem-7, TSH, Vitamin D, and a D-dimer) in order to determine why I was still having trouble breathing and why I am feeling more and more exhausted.  The only abnormal lab was a slightly decreased vitamin D level.  Now, every time I try to exercise, I experience a sharp, stabbing, burning pain from my throat down my bronchiole tubes.  I even feel it under my tongue.  It becomes really hard to breath due to a sharp pain on inhalation, and I need to sit down for about an hour for it to go away, even if I only ran a block or two.  I do not feel like the symptoms are related to my asthma, as I have never experienced anything like this in my 20 years as an asthmatic.  I also feel pain in my ears followed by dizziness, and I have been getting headaches more frequently.  I then feel really weak and am barely able to walk.  I have also noticed that my lymph nodes have been swolled since December, and that I occasionally have what looks like blisters on my throat that come and go.  Since I have been to two doctors for these symptoms and no one has been able to figure out what is going on, I thought I would see what responses I get here and hope that it helps.  What do these symptoms correlate to?