Terrible cough, mucus, wheezing for 7 weeks

I am a typically healthy 24-year-old female, 5'9 and 145 lbs. For the past seven weeks, I have had a consistent productive cough, nasal congestion, and flu-like symptoms and have been completely unable to get rid of whatever this is. I've had a fever on and off, but never over 100 degrees and infrequently. My cough is the worst part and I am coughing up mucus from what feels like deep down in my chest (yellow and green in color) throughout the day. I'm also wheezing and frequently feel out of breath when climbing the stairs to my apartment or doing anything remotely strenuous. I'm extremely tired, often sleeping up to 10 hours per night, and have noticed a lot of joint/muscle pain in my neck and back especially. My lymph nodes are also swollen in my neck.

Up until getting sick, I was working out regularly and in very good shape. I eat a healthy diet, don't drink much alcohol, and have never smoked. I have never experienced persistent symptoms like this for such a long duration. I have been to my doctor three times now, and each time was prescribed something new - first, a course of doxycycline, which I completed and felt no better. Then he prescribed levofloxacin because he thought that I might have developed pneumonia. This I also completed, and still felt the same. Finally, after 6 weeks, I went back in again and got a chest x-ray, blood work, and a urine sample. All came back normal - no sign of TB, negative for HIV, no elevated white blood cell counts. Nothing abnormal in my lungs. He prescribed me a three day course of prednisone to try to decrease some of the swelling in my airway and ears (my eardrums were visibly swollen and irritated, and my right ear has felt "blocked" for the past 5 days or so). The steroid helped perhaps a tiny bit, but now that I'm done with it, I'm right back to square one.

What the heck is going on and how can I get rid of this? I'm allergic to amoxicillin and understand why my doctor doesn't want to prescribe any other antibiotics, as it doesn't seem likely to be an infection. It's not contagious, because my roommate and coworkers are fine and none have gotten sick. Just want to know what I can do to be back to normal, I'm starting to get desperate. No amount of water and vitamin C seems to make a dent. 

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