Your post reminded me of myself 4 years ago...I was working in a mold infested environment & was misdiagnosed for 6 years. Please consult a pulmonogist, preferably associated with a teaching & reasearch hospital, such as Nat Jewish, Mayos, or a large university hosptial. There are a number of rare lung diseases from enviornmental exposures. Mine happens to be hypersensitivity pneumonitis.
Have you had pulmonary function testing, blood panels for mold antibodies, CT scans of your lungs? Those should be routine for a mold exposure. Those tests are also necessary to establish your disability for SSDI. One of the pulmonary function tests called DLCO which measures your lungs capacity to diffuse carbon dioxide is a threshold test for SSDI--I forget what the number is, but think its 40% of predicted (normal for your ht & wt) that you need for SSDI. Mine was 35% and I got SSDI the first try.
Good news is, prednisone is the first line of treatment for these types of lung diseases, but its not the only thing. Don't wait as long as I did to get a second opinion. You will be in my thoughts & prayers.
It is the rarest of people with asthma, who would have to be on prednisone, 80 mg daily. You mention mold spores. It is possible that you have a chronic fungal infection with a fungus called Aspergillus, one often seen with asthma that can cause both infection and an allergic response.
Everything you describe, with the exception of your asthma and breathing, could be a steroid side effect. Extreme efforts should be made to either reduce the dose or get you off the prednisone. At age 31, it is crucial that you arrange for expert evaluation and treatment of your asthma. If you live in the eastern United States, you should make an appointment at the University of Pittsburgh Medical Center, Allergy & Asthma Division or at the Johns Hopkins Medical Center in Baltimore, Maryland. If you live in the western or mid-western United States you should arrange to be seen at National Jewish Health in Denver, Colorado.
Good luck.