How Can Stomach Upset And Discomfort In The Lower Abdomen Be Treated?

Hi, Its been almost 6 years now and ihave been suffering from a chronic case of a really upset tummy i have this uncomfortable feeling in my lower abdomen most of the time. I have to pass stools and 2-3 times a day and even then i feel unsatisfied.i feel as if my stomach has not cleared up..not because it is psychological.because i feel bloated even after passing stools. Even the mildest spice ends up with me getting a bad case of acidity immediately and an upset stomach the next day. I am a girl and i am only 24 years old. My upset tummy is what u call a headache to me. Can you please suggest what can be done?