Sara, what sort of food do you eat normally? I can't maintain it, but for events and stuff like that, if my clothes are a little tight, I try to low carb it before the event, which usually helps me. Low carb isn't for me in the long term, but I think it'll work in the short term.
Also, I felt the same way recently - my weight really crept up on me and I couldn't shift, despite eating healthy and exercising a lot, so I started hardcore food journaling and measuring, and that's helped some of it start to come off.
That and no booze when I really want to drop, but you said you already did that!