I nhave only just strted eating breakfast recently. And I haven't eaten breakfast since I was 15, and I rarely eat lunch. I eat just like you. Dinner in the evening, and I'll allow myself a little junk. My brother is a fitness instructior, and he said that although its not great to only eat once a day, if you have been doing it for a while your metabloism will slow down to compensate, as that is just your regular eating pattern. I only have peanut butter on toast in the morning and apart from that I really only have the one meal a day. If that is what fits in to your lifestyle plan and you are getting all the nutrients you need don't beat yourself up about it. try snacking on small stuff during the day, friut or something else healthy, just to keep your metabolism kicking over and so you don't "crash". Other than that if it is just stress your appitite will return once things start to improove. No-one is perfect and I doubt many people eat like they should. so don't beat yourself up.