Gastritis and asthma. The exact cause.

I am a student and I eat out everyday. I am experiencing heartburn, burning in chest, waist, hands, neck region, bitter mouth, frequent hiccups, feeling like something is always there in my throat , weakness, nausea like, passing excessive gas, bloating, burping, and frequent hunger ,cramping in stomach and my stool colour has also changed since a week and I am a asthma patient as well. I don't know why I feel if these symptoms increases asthma increases and if asthma increases these symptoms increase. And when I sleep my waist starts burning like anything. I tried nexpro rd 40 and rantac.... They'll relieve me for some time but again symptoms will go on increasing. I am 83.5 kg, 20yrs male. Please suggest me a permanent remedy for it and please tell me the exact cause.