Thank you for your question, first thing is that you have to make sure these symptoms are not caused by something else like a heart problem. I would advise you to have an ECG and troponin levels if these are ok then we can treat your symptoms as stomach or gut alter. Only omeprazole is not sufficient to control the symptoms, in most cases these users are due to H.pylori bacteria and they need triple therapy for 2-3 weeks which includes antibiotics along with acid suppressant to control the symptoms. My advise is that you discuss this triple therapy with your doctor as it can cure this problem with accuracy of more than 80%. Thank you.