Unfortunately, I do not know the answer to your question.
But, my band has slipped twice. I had the same problem when it happened, I could not get liquids or anything else down. However, both times I had a complete unfill for about a month. In addition, I did liquids only for several days after the unfill. When I returned to my doctor, he did a flouroscopy and both times my band had gone back into place. So, perhaps yours will too.