Lazy & unmotivated!

I used to be in shape while I was in the military. I got out 5 years ago and have gained over 80lbs. I'm a stress & excessive overeater. I used to be so disciplined but now I can't seem to stop eating or exercise regularly. I suffer from major depression, PCOS & hypothyroidism, but I know if I just take better care of myself and accomplish my goals, I could feel just a little better about myself. I feel worthless and unsatisfied with my life. I just keep eating. I want to change my lifestyle but I'm unmotivated, lazy & depressed. How have some of you changed your lifestyles despite your individual obstacles? ( it doesnt have to be the same or similar to my problems)