Gas & acidity together. Eating timings.

I am a mother of 2 yr old baby.i used to eat spicy food and also not on time.now I got acidity and gas problem. I stopped eating all food s that cause acidity and gas and am on diet.i am using omeprazole 1 time in a day and tricane 3 times a day..acc to doc prescription.when I eat acidity causing foods like tomato, am getting pin sensation in my abdomen and it goes away with in some time, but gas effects me a lot. Iam getting burpings and also chest pain in both right left and also middle parts..from 2 days am using tricane and from 8 days am using omeprazole from yesterday am not getting any pain..only when I eat some foods am getting pain...I want to confirm is it an ulcer or normal acidity and gas..because I don't have any other symptoms other than pain..no black stools,nausea,vomiting,and am hungry also..my stool test for h pylori is also negative.should I consult a gasentrologist or is it ok if change my diet and eating timings...please give me a clarity.thank you.