You need to take a deep breath, and relax. Many people have reflux for a lifetime (longer than you've been alive) and don't end up with cancer. As Joy suggested, you should get a doctor to do a complete workup...she listed the tests that would be helpful.
Before going off PPI's it would make sense to find out what's really happening.
Persevere and be assertive until you get answers. You have rights as a patient, and insist that your doctor speak plainly to you and listen respectfully to your complaints.
Good luck! You can do it!