Hi, please any advice is helpful. I have been suffering with acid stomach for about 6 months. Doc put me on omeprazole 20mg and have been much better in general since until last couple of weeks. Have been getting nausea again and a sudden feeling like I may gag and a sore tummy, like a burning/stinging feeling just below my sternum. Today I forgot my omeprazole and took a zantac instead whilst out as I had acid heartburn. I have emetophobia (fear of vomiting) and am terrified I have stomach oesophageal cancer or liver cancer etc and am terrified that doc will order endoscopy as this is out of the question for me! Please help, why is the omeprazole not working so well anymore? Why am I so afraid of these symptoms, which is probably making things worse? Why, when I was doing so well and had come so far. Do I have something serious wrong??