Indigestion for 4/5 months. Cancer or gastritis?

So, I had this burning feeling in my stomach appear from out of nowhere and eventually decided to go see the doctor about it. I was told it's just an inflamed lining of the stomach (gastritis). I also have laryngopharyngeal reflux if that helps any. I've also started to burp a lot, which is supposedly a symptom of early stomach cancer. I was prescribed omerprazole (20mg twice a day) each month until now. I've had enough of not knowing what I'm dealing with here. My doctor believes I have cancer-phobia(?) and just dismisses me. I've also seen 2 other GP's for second opinions and they gave me the same answer and talked about how rare it is for someone my age without risk factors to develop it etc etc.(I'm 20.) I have an endoscopy booked for late august but that feels too far away. I literally can't cope anymore. I've considered going private and getting the endoscopy over and done with but it's really expensive to see a gastroenterologist. So any opinions would be greatly appreciated because I no longer know what to do. I don't even want to get out of bed anymore. Should i go private and just be in debt for a while or should I wait it out and hope it isn't anything serious? Also, if anybody has an actual statistic or something so I know exactly how rare this kind of cancer is for a 20 year old that would also be very helpful. Sorry if this sounds like a rant, I just have nobody else to talk to about this. Nobody takes me seriously. Thanks

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