Pain at stomach sides. Something else?

I'm having little pain at sides of stomach since last 1 month. The pain is not sharp but it occurs sometimes and is like some pricking pain. Sometimes I feel the bowels not fully emptying and also sometimes it's difficult to pass out gas. There's no other symptom like fever, vomitting, etc. Initially I thought it would be kidney stones but after CT scan I don't think so. Also, my blood tests(CBC, CRP, ESR), KFT, LFT, urine culture reports are normal. I have attached some pictures but can't attach more than 2. I was eating junk food, non-veg, spicy food since sometime. I've now started drinking 3-4 litres of water daily alongwith less spicy, oily food. Taking curd or drinking buttermilk makes me feel some better. Can someone help me know if this pain be due to gas? Or it can be something else?