Hi Tammy,
I had a friend who had Barrets and she never got cancer and her doctor told her that her esophagus looked like a dried up snake on the road, so I think you can go pretty long as long as you try to keep from anymore damage.
Anyway, she opted for the fundo surgery because she couldn't even drink a glass of water without reflux. After the surgery, her esophagus came back to 90% normal and she's fine today, eats whatever she wants.
I really hope you get some relief.