If you dont know what disease it is, how do you its called "dyspepsia"
It always better to consult a doctor, they'd be able to help you better here.
After a google search is found that its related to Indigestion, and its common ailment.
Only thing you can do is start eating right, which means having meals in after 2-3 hours instead of eating in bulk only 2-3 times a day. and you also need to start exercising to increase your metabolism rate. Cardios are the best thing for it.
