I Am Having Stomach Pain Since Morning. I Had A

I am having stomach pain since morning. I had a breakfast of few biscuits and juice around 8 and then another light spicy breakfast around 10:50. Since last 1 and half hours I have been feeling my stomach like little warm from inside and if I burp, feels like gas coming out of my mouth. Then I feel relaxed. But again it starts generating the same. I feel slightly like vomiting but not being able to. I got one digene tablet. But yet to take it.
Any suggestions what is this for and what can be done for this?