Barbara, my coach is on anti depressants, I think four different ones. She works for Ideal Protein and also goes to the TOPS here. Her mom is actually the TOPS queen for our province. They both go there for support, and both were on Ideal Protein to lose the weight. It can be a bit pricey but I suggest you may want to look into it and find out if it could work for you. The weight loss is well monitored to make sure you're still healthy but you're actually not supposed to exercise on this program. That was one big perk for me. She also said that her moods started getting easier to manage with the program as well. Different things work for different people, but I just felt like I should let you know that after you mentioned your struggles with exercise. In a month I'm down just shy of 20 pounds, not a bit of time spent exercising. My coach was never athletic and her mom has physical restrictions that completely prevent her from working out and they both attribute their success to this program.
Whatever you do in the end, I believe you can do it. Just believe in yourself. I recently went through a bit of a rough patch and just wanted to cave, get chocolate, and shut down. Every time I resisted that urge I felt empowered and stronger. Every time you resist the urge to give up even the next day think about it. Tell yourself what an excellent job you did, and how much stronger you are for keeping going. Then next time you feel like giving up remind yourself that you did it before, you can do it again. One thing I want to start doing is writing down the days when I've wanted to give up. Then when I feel like giving up again, look at the list, keep going, and write down another day. A victory journal. Or something as simple as tallies. Even if you don't see what you want to see on the scale, perseverance is still something you can be proud of. Use that to encourage yourself. You CAN do it!
And there may be days where you do fall apart. Don't let those discourage you if they do happen. Don't record that, don't stop recording your victories. Focus on the positives, the accomplishments. Forgive yourself. Then refocus on your goals and move past it. It's a little difficult but try to find a good balance between recognizing it so that you don't make too much light of it that you are compelled to slip again and feel it's no big deal, and beating up on yourself because that will just make you feel worse and perpetuate the cycle. Look at slips as non judgementally as possible. It's fact, it happened, now I get back on track.
I hope some of this helped. You can do this and you are not alone.