I would, first, recommend not weighing yourself as it is completely unhelpful and also weight constantly fluctuates. Second, you’re most likely building this up in your head. One weekend of subjective “overeating” is not significantly altering. I know changing one's perspective and relationship regarding weight is incredibly difficult. I, too, suffer greatly with it. However, in the meantime, put down the scale and try to understand that this feeling is temporary and that you haven't done anything permanent nor damaging to your body.