Weight loss

I seriously am in need of some major motivation... I've recently found out that I've got celiac disease... and it's terrible and I had lost a whole bunch of weight. But, I've changed jobs to where I do nothing but sit all day, and I've also gotten back with a guy who does nothing but eat all the time and makes me eat with him... I've gained at least ten pounds back, and I'm afraid to check and see how much more. I just need the motivation to get the weight back off plus more. :(