Talk to General Physician on Breathing Problem While Sleeping

I have experience breathing problem when lie down straight even use polister pillow to up my head while sleeping but feel like shortness of breath mucus stuck in my throats I have some stomach issues also when I drink tea or lassi ya yogurt the chronic cough strt every time I feel like mucus stuck in my throats well m taking stress to sometime experience heart burn then take gaviscon syrup fall asleep on taking side can't sleep while lying starting what should I do