Clinical Assessment and Recommended Next

Doctor, I have been experiencing the following problems for quite some time: - I have excessive gas formation in my stomach. - I frequently experience stomach cramps and spasms. - After eating, my stomach feels very full and under pressure. - Sometimes, in the upper abdominal area (near the ribs), it feels as though something is pressing or gnawing from the inside. - Even slight pressure on any part of my body makes it feel as if that area is being pressed hard. - I have to use the washroom frequently. - I feel hungry very often; if I delay eating, I start to tremble, but the trembling stops after I eat. These issues are affecting my daily life. Please examine me thoroughly to determine the possible cause and, if necessary, prescribe the required medicines and tests.