Hi, My Stomach Been Hurting For The Past 3 Weeks

Hi, my stomach been hurting for the past 3 weeks now, its burning like hell. I went to the ER, but i found out that i have a cyst which i knew i have. But then, the burning inside my stomach won't go away, the Dr told me i may have acid reflux, i been taking Omeprazole, it still doesn't.. any advice please, because this is really hurts.