Instead of getting on the scale, pay attention to how satisfying it feels to wake up after a good night's sleep. Notice and enjoy it if work feels better because you're calm and can cope with the bullshit better. Don't get distracted by what you may or may not weigh. "More pleasure, less measure" helps commitments stick.
When I'd gained weight
I was in one of my dozen stints in the joint (my term for Weight Watchers) when I strutted in for my weekly weigh-in after a perfect, cheat-free week. I felt like Wonder Woman: strong, capable, and like I was using my powers for good.
But the scale said I'd gained weight.
I lost my superpowers and critical-thinking skills on the spot. Every exercise class I'd gone to, every meal I'd painstakingly prepared, every glass of water I'd chugged, it was all useless. "Nothing I do matters, so what's the point?" I thought. I sat through the meeting, planning what treats I'd buy on my way home to make up for lost time.