Suggest Treatment For Severe Chest And Abdominal Pain

Im 29 yrs old 150pounds and for the last month ive been to the hospital 4 times with severe chest and abdominal pain. They tell me i have Gastritis after performing ekg's , x-ray's , blood and urine , xonogram and such . They have prescribed , Bentyl , Zegerid , Zantac , Carafate and others. Nothing seems to work and my pain comes and goes in varying degrees of pain to extreme pain. Is there anything that can provide relief or is there something entirely wrong with me ? The pain is mainly situated right under my left nipple but it can radiate to basically my whole left side of my torso