What Causes Noises The Abdomen?

I Hear Noises in my Stomach while Playing Flute I’m a 20 year old girl and I’ve played flute for 5 months. Abdominal breathing is a must for brass players obviously and I didn’t have any problem with it until I realized I could hear noises in my stomach every time I use my diaphragm to exhale and inhale. It increased as I played flute more and more for the following months. I have a bad feeling in the areas of my stomach and throat as well and I burp especially after playing flute. When I stop playing for a while for example 2 days it gets better. About 3 months ago I visited an internist; at first he said I have reflux and prescribed Domperidone and Mebeverine and told me to do a CT scan. After 2 or 3 weeks using the drugs (with temporary effects; the noises decreased for only 2h after using) from the results of CTscan he told me the problem is more serious than we thought; he diagnosed the pressure of air has raised the capacity of my lungs, an amount of air remains in them, then the extra air transfers into my stomach. I visited a lung specialist who asked me to take Spirometry and MCT test. She diagnosed I have asthma and prescribed antihistamines and a Symbicort spray to use twice a day. (The day I went for the test I had a cold so I think it’s probable the test hasn’t been taken properly). I used the spray for 2 days but I’ve quit it because I have no sign for asthma. It’s notable that I have had inhalation of smoke especially in my childhood because my father smokes(though currently I’m exposed to it less); but I have had no symptoms of asthma and no disturbance in my breathing while playing flute, or in my daily life. I only suffer from swallowed air stock in my stomach which causes embarrassing noises. My flute teacher told me it’s not a common problem and none of his students has ever faced something like this. Anyway I’m trying to have a more healthy diet in case food habits would affect my body ( by not drinking water in the middle of my meal anymore and I’ve reduced the foodstuffs which cause gas accumulation in stomach). The doctors advised me to quit playing but I wonder if there’s any way to reduce the noises and I want to ask you if you agree with my doctors and if I have asthma(with no symptoms)?? What has caused this problem exactly? What could happen if I continue my playing? I’m attaching a copy of my CT scan results and the Spirometry test. I really appreciate it if you could answer my questions and also offer some solutions.