That's really terrible and I hope they figure it out soon, I've had too slips and the first time I slipped I had difficulties keeping down liquid, even with an empty band. I'm also an ER nurse and it sounds to me like you need an esophogram and an endoscopy. I hope it all works out.
As for hope, I have to say that even after four surgeries I love my band and it has all been worth it. What your going through now is rough but don't give up on the band.
Nina