Hi, Edward, try not to worry. If your doctor did full bloods that came back normal then it's pretty safe to say that you're ok. They test for things like cancer with blood tests. Your anxiety is probably making the reflux worse, then your bad reflux makes you more anxious. I know this vicious cycle and its really hard to break.
Does the medication help? Maybe it needs revising if things are getting worse now. Have a talk with your doctor, he/she may be able to try you on something different, another PPI maybe.
I know how worried we can get over this illness, its hard not to, my heart goes out to you. Hang in there.