Hon, you are a SUCCESS!! You have lost 50 pounds, even in the midst of temptation and stress that would bow and break a lesser woman. You are still coming here, even though so many others drop from the board when they come up against bad weeks or fall off the wagon.
You have such strength, and are such an inspiration to me. You are aware of your family problems (not sticking your head in the sand), and yet you care for your mother. You have a history of terrible events and yet you labor in love to support and care for your family. A lesser woman would have broken. Given up on her mother. Drunk the Pepsi. Eaten the off-plan food.
But you haven't failed. You're here. You keep fighting. And you're surviving. THIS is what you do for you. Ranting, venting, taking care of yourself... it's all so very important when you're in a stressful situation.
That being said, I do hope you can slowly make some changes in your situation so that it is less stressful. If you're the main grocery-shopper can you get less Pepsi, and not get more until next grocery trip? Wean them away from drinking it all day? Move the off-plan food into a special cupboard so they can get it but you don't have to deal with it? Cook slow-cooker meals on weekends so that you're not so crazy-busy with cooking every night?
You can also see if your church or community groups have any "caretaker support" groups or opportunities. Even if someone can come in to take care of your family once in a while so you have an evening off, it could make a huge change.
Looks like there may be some useful support groups in your area...
http://www.nevadacareconnection.org/...tgroupmeetings
And here is a listing of senior care providers... you might be able to hire someone to come in one evening a week or something.
http://www.care.com/senior-care-las-...-q1957080.html