Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. Your symptoms may indicate a specific condition called hiatal hernia and this means that stomach is protruding through diaphragm muscle. It may cause breathing difficulties, nausea, swallowing difficulties, and irritation of stomach. It will also be aggravated by certain food or medications, stress and smoking. You need to avoid fried food, carbonated drinks, coffee, alcohol, and spicy food. You should eat more milk products, vegetables, and boiled food. Also, certain antacid medications may be required and as a last option, it is possible to perform surgical repair of hernia, especially if there are progressive respiratory discomfort and dyspepsia. To diagnose it you should do gastroscopy and if this is negative, as in your case, then you should do contrast x-rays of stomach. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Ivan R. Rommstein