Feeling bloating and motion. Be serious?

Hi doctor, Since few days , i am feeling bloating after eating any food and feel like going motion. I feel better after passing motion for few hours. I gets lots of burping with loud sounds. I did my CBC, crp , esr and lft tests. All are normal. Sometime, i get diahera also( but always ). There is just heaviness in lower abdominal. There is no stomach pain or any fever. I lost 3kg in last 3 months.( I have left outside food and milk since 1 month). I visited 4 gastroenterology and they examined me physically and said that just gastric issue. I am really worried with all this symptoms. I am unable to focus on nornal life. What could be serious ?? Is all these system something life threatening.?? I dnt want to die now...i am just 32 and just started life.