My father had his gall bladder removed about 4 months ago. He is 75 and in otherwise good health. Since then, he has had 3 attacks that were identical to what he experienced before surgery. The attacks start with severe pain, then lead to vomiting that lasts between 4 to 6 hours. He also sweats profusely. He said that the last time this happened, he passed bile with his urine. I didn't know that was possible but am very concerned. Please advise.