Hi Tsalagi,
You have been hit with some challenging times and this is the time for you to get even stronger through them. Keep in mind that getting healthy and losing weight is for YOU - and it's sopmething positive that you and you alone can control. Get empowered by that sense of control and try to channel any negativity and energy into your workouts.
When you exercise, you are actually giving your whole system a boost that will help to combat depression. Even when you feel you can't or don't want to exercise, that's the time when it's most critical. Keep a journal to chart your progress, pull in a friend to keep you on track, post a motivating picture on your refrigerator, listen to motivating music that will pump you up to work up a sweat. Most of all, remember that taking care of yourself is a precious gift and you can do it!
One other thing I recommend is to try changing up your cardio exercise from time to time. Interval training, hills, etc. are all great ways to vary your intensity and it will help to keep your workouts interesting and challenging.
Keep me posted and know you are going to overcome!
Good Luck.
Paul