One thing which I have picked up on is how people get so worried about how well they're doing, or because their weekly weigh in is due. It really is quite sad.
I can't say that I haven't been upset about my creeping waist line, or increasing weight appearing on the scales; but at least I could say that I've only myself to blame. Although I've lost weight in the past (and then started to indulge again putting the weight back on), I actually found I was quite excited and looking forward to see if I'd lost anything. If I'd lost more than a lb or two, then I was mega-chuffed. If I'd put a bit of weight back on then I'd obviously feel deflated or at least could identify what may have caused me not to loose. The dreaded time of the month, the nibbles, going out, etc
I appreciate we're all different, and not just in weights and measures, but surely no one should send themselves on guilt trips before we've even got to the scales?
I don't have an answer to this question, but maybe a different approach to the lead up to your weigh in? By making it a positive one could relieve some of the stress, and we know that we all suffer too much stress from other sources without adding to it.