Slimmerkiwi has given you some good pointers. I take Wellbutrin for my depression. It has helped me more than I can say. I was in a very dark place, and this medication has lifted me out of it and given me the ability to go on with life.
Working out makes a tremendous difference. If I miss too many days of exercise, I can feel it in my emotional life. If you aren't currently doing any exercise, I highly recommend you try to start at least 10 minutes per day- walk around the block or even march in place in your living room for 10 minutes to peppy music.
As for the emotional eating, it's very hard. I haven't found a great way to battle it except to remove myself from the food, by going outside and doing something, or drinking a nice cup of tea, or just sitting and really examining why I think I need to eat.