Catherine, don't read the negative! Read the overwhelming number of positives! You will be fine. My surgery is 8/12 and I know it's the right choice for me. It will be for you too! As someone else said, "you can do this!"
My surgery is also 8/12. I too had tested positive for h-pylori and had to take the antibiotic treatment. I was told it was very common to fail. Fortunately I had enough time to be re-tested before my surgery was scheduled. I passed the re-test. Don't worry, it will only be a short delay.