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I am sorry but surgery sounds like the only option at this point. The fibers are non-digestible and will just set in his stomach. They tend to ball up and reach a size that make them impossible to pass thru his stomach. You also have the option of endoscopy to possible have it removed without actually have to cut into his stomach, but this would also run about the same cost. Yes, if it is not removed he would die from recurrent vomiting and dehydration.
Sorry for the bad news,