Stomach Discomfort. Please guide me.

Hello Doctors, Good Morning I am 24 years old, i am a CA student and most of the time i am having a sedentary lifestyle. From the past few years i had some stomach discomfortness like burping, gas trouble and constipation. But nowadays i also having some kind of doscomfortness in abdomen such as pressure or something like stuck in left abdomen/stomach area. Some sort of light pain in left chest area and some kind of pressure also which gets reduced after a hard or light burping. Most of the time i get relief after a burp. But things aren't going well. Eating curd 400 mg everyday and having a part of meals. Then also having same kind of problem such as pressure or stucky feeling in stomach or abdmomen left. No stomach pain or no changes in appetite. I don't know what is happening done USG,ECG,TMT for my stomach and chest pains all are normal. But why this type of stomach discomfortness happening and mostly i am not having a proper bowel movement. Please guide me.