I too am a teacher & had planned to have my sleeve done this summer. Due to insurance issues I had to move it up to May & take 2 weeks off school. There were a few very close friends who knew about my journey, but I felt most people didn't need to know. For those who asked, I kept it simple.... I simply said I was having some abdominal surgery. If they pressed it further I told them it was nothing major. For some who wouldnt leave well enough alone, I did tell them I was having a hyatial hernia fixed because I did have one & the surgeon evaluated it while doing my sleeve (didn't need surgical correction & fixed itself after the sleeve).
Going back to work was a whole different ballgame! I started losing weight immediately & it was noticeable. A few people guessed. Those who asked what was going on, I told them my diabetes was under control & I was losing weight. I was the truth. My glucose was 99 2 hrs after surgery, and I WAS losing weight. They just lumped the two together.