Mary, my mom got divorced at 57. She was married for 35 years. She had a REALLY hard time with things. She went to divorce care and it helped her out tremendously. I think they are six week sessions. She went to three of them. I am pretty sure it was free.
http://www.divorcecare.org/ She lives in a town of 6,000 so it's definitely available in rural areas.
I think what you need to do is create a life for yourself. It doesn't have to be about dieting at all. I think you just need to get yourself out there. The weight loss at first will come naturally if you're getting a bit busier than you are right now. And, as you work on making positive changes in your life you'll love yourself more. And as you love yourself more you'll want to take better care of your body!
I would definitely think about what you like to do and find a way to make it a social thing that gets you out of the house. Book Club? Gardening Club? Church Choir? I, myself, have tried ALL SORTS of activities in order to increase my social activity. Some of failed me a bit. I did soccer and just never really got into the clique. Some have been great, though. So, if you don't fit in immediately with something give it some time, and if you still don't fit in try something else. There's things out there for you, though, I promise.
Really, what someone already said, you don't fail until you stop trying! Check out divorce care, though. Both of my parents swear by it.