Can I ask, are you depressed because you are overweight?? Or is it something else? Or are you depressed because you are falling off the diet wagon? I think this is an important question to ask yourself.
I was well over 24st a few years ago, I was depressed because my life wasn't panning out the way I had thought it would, as a consequence is was massively overweight and endangering my health. The weight wasn't causing the depression it was a symptom of other things that were going on. By total chance I was lying in bed one night and I couldn't sleep, so I turned on the shopping channel (QVC) and there with his big flashy white teeth and American accent was Anthony Robbins punting one of his "feel better and get on with your life" type courses. Usually I'd just raise my eyes to heaven and think what a waste of time, does anyone really think these things will work!! But this time I listened to him for a few minutes and what he said really struck a chord with me, basically his message was, decide what you want to do, write a list, and take action. I realised I am very good at the first 2 steps, but the actual getting of my butt and taking action was the bit that was missing. I didn't get the very expensive course from QVC, but I did get a book of his and in about 15 months the following happened.
I left my then husband, chucked my job and moved back to Scotland, passed my driving test, lost 11.5 stone, got a better job, paid off all my debts, bought a car, met new lovely Irish husband (still together now), moved to Ireland, got an even better job and then finally I started my own fairly successful business.
I feel, just from my own experience, that weight is rarely about what it seems and often has a number of different contributory factors.
Just my tuppence worth, but maybe it might get you thinking. Good luck xxxx