Ive been burping alot

Hi Im 22 years old and just last week i notice something different in me. I started with pain in my left chest , then i beggin to burp alot and everytime i burp my chest would hurt then the pain would go away. Now I dont get hugry anymore i feel like gases on my stomach and like if i got something stuck in my throat. I try eating or drinking water and i notice that it would hurt in my chest area. I now im not that healthy but im getting scared because i have never felt like this. I try Omoprazole but I felt sick from my stomach, What i also notice was that my breath stincks more even if i brush my teeth.. I got a sour sentation in my mouth, I just want to stop burping, have the pain away from my chest and eat again.I will change my way of eating and get in a diate if its necessary.. I havent been to a doctor yet beacuse to be honest im scared. If anyone could help me please do so. i need a cure Please..thanks