First of all, please try not to think worst case scenario. Second, you need to try and find ways to relax (deep breathing, reading, whatever helps) because anxiety causes your stomach to produce more stomach acid. The digestive system is very much connected to our emotions. Give the medication time to work, and in the mean time, watch your diet and see if that helps. Stay away from acidic foods like tomatoes, peppers, organges etc as well as chocolate, coffee, caffine, soda, smoking, high fat and fried foods and processed foods. Do not eat before bed, eat at a time where you will have 3 hours to digest your food. You may also consider going gluten free. I am willing to bet that you do not have cancer. We all fear this but cancer appears to be a very low risk. You can also try gaviscon (it is an OTC) to see if that helps you as well. Good luck, and check out the threads on this forum to help ease your anxiety.
GERD Moderator; Diagnosed GERD, no other medical conditions (this one is enough)