You may want to start with AA meeting. Not saying you are an alcoholic at this point but it's a good place to stop the drinking. That should also help your weight issue. Then for yourself and your son get out there and exercise. You can get your weight back down and your confidence will go up.

Spend quality time with your son when you can. You can still have a great relationship with your son. Build on that.

You might want to see a counselor to help you relieve yourself from all your guilt. Life happens and we have to make the best of it.