I find it comforting to know that others are having the same issues or challenges. It does not matter how many times the question comes up. But anyhoo, I had the same experience. I took biotin and a multivitamin prior to surgery, but I don't really think it prevented anything. I still take both. I was sleeved on 6/1 and the hair loss started about 4 months in. It is totally normal after a major surgery and anesthesia. I kept my hair a little shorter and did not go too dark on my hair color to help me mentally a bit. My hair started coming back at about 6 months so that was a relief. Yours will too. Hang in there.