Only told my husband, and very glad I stopped there. Even if the comments aren't negative, which I'm sure a lot would be, I didn't want to hear any comments, ANY. I struggle with rewiring my mind and how it thinks about food. I struggle getting away from the diet mentality. The only way I will be successful is if this is not a diet, but a lifestyle. I have lost a lot of weight, and I hear comments and questions all the time, and it's exhausting, what diet are you on? how much do you exercise? did you know you can burn more walking stairs? have you tried weight lifting? you know, low carb is not good for you....question after question, and it stresses me out. I have a coworker that religiously watches what I eat at my desk now, and always feels the need to start a conversation about it. I can't imagine what it would be like if they knew of the surgery. In addition, I don't want people to forever see me as my surgery.
I had the same fear, of people finding out, or how to hide it. At gatherings, I can always find something remotely healthy, and stay away from stuff that's not healthy. For the first month, I really stayed away from gatherings, since I knew I couldn't eat regular food yet, and had massive head hunger. I'm 3.5 mo out, and can eat regularly, just much much less. I eat slow and while a few ladies have asked why I'm eating less, "I had a big lunch" has been enough to shut down any further conversation. I used to go to gatherings anticipating food, wondering what food I will get to eat. I now go and think about the people I'll see. It's hard to explain what that mental weight off my shoulders it is. I want to eat like a normal person, and be a normal person, not "the fat girl that had surgery", so that's why I kept it secret and I have not regretted it.
As for a good excuse to use for time off. I know a lot of people use gallbladder surgery. I said I had some issues with my colon, left if vague. If people keep asking (which only two have), I've said I really don't know much about it, it's all doctor-speak to me, they just need to clean it out. From there on, I keep reiterating, I really don't know. No one has pushed past that. Short answers and vague.
Good luck!