What you describe, the fairly sudden progression of heretofore controllable asthma to very difficult to control asthma is unusual but not unheard of. In most instances, the cause can be found, but not always. But, you are right to ask if this is truly what has happened. The elevated IgE may provide a clue. High levels are associated with a condition, seen mostly in people with asthma, called allergic bronchopulmonary mycosis (ABPM), an allergic reaction to one of a number of fungi.
Beyond that condition, there are other lung diseases, usually with abnormal chest x-ray findings, that could be the cause of your symptoms, superimposed on the asthma. These could include recurrent pulmonary emboli, commonly called clots to the lungs, hypersensitivity pneumonitis (HP), endobronchial sarcoidosis, which is in the airways, and diseases of the blood vessels of the lungs, some with pulmonary hypertension.
Bottom line – this may not be just asthma and your doctors might want to consider additional testing, including blood tests, complete pulmonary function tests (PFTs), CT scanning of your lungs and maybe even bronchoscopy. If they don't, you should seek yet another opinion from a pulmonary specialist at a lung center such as the National Jewish Medical and Research Center or the Johns Hopkins Medical Center or the Mayo Clinic. If that is not feasible, you might want to get another pulmonologist’s opinion at the nearest medical school clinic.
It could be a heart condition. In that case, you don't want to undertake any exercise without medical advice!
Oops! Scratch that last comment! I didn't notice that you mentioned the chest pains. Be careful! Could somebody please delete my posts?
Don't give up. It can take years to find a doctor who will even listen. Exercise and allergy shots help tons. I have this condition. Makes you want to hit somebody, doesn't it?