Gastritis

I have been here before with problems after gall bladder removal .I must say I am being taken good care of by the hospital and have had scans which have shown no retained stone .In two weeks I am going to have an gastrooscopy. I would like to know if anyone has had similar symptoms to mine . I am in discomfort after eating .I don’t eat much and am losing weight .It isn’t pain it’s a feeling of being really ill . It can pass off then come back . I don’t know how I will be each day and I have two weeks before the camera so would like to know has anyone suffered from gastritis and what were the symptoms .also has anyone had this procedure where they have found a retained stone with the camera ,I am not worrying about cancer as I think this has been eliminated but the whole business is stopping me doing the things I normally do .I am afraid to plan ahead as I never know how each day will be .If anyone has been where I am I would love to hear your experience