I'm feeling really low and anxious, I'm going to a wedding today with people I've not seen for well over a year. In the mean time I've suffered depression, anxiety and binge eating. I've gained loads of weight! I'm so worried about what people will think when they see me!
I'm going to say something that you already know intellectually: People are so wrapped up in their personal lives that they probably won't notice the change of weight that you're so concerned about and even if they do, it will be a quickly passing thought so get out there and have a great time at the wedding.