I have pain just below the arm on my chest for three days and I used omeprazole which reduced the pain. Should I contineou taking omeprazol?

See Doctor. This could be heartburn & taking a ppi like omeprazol can help. However, you need to see the dr to make sure it is heartburn & not something else. Also, if you have been having pain for awhile, your dr may want to check if you have gerd & if it is causing changes to your esophagus (called barretts). There are other meds, different doses, drug interactions & side effects that should be discussed.