LovelyLeah! I'm SO sorry your'e so stressed! I can tell you that I have my share of intense stress like that in my life too, which I won't get into, but I want you to know that your'e not alone.
I will just tell you that if you're tempted to binge, keep in mind this quote: "If food is not the problem, then food is not the solution." That one has really resonated with me lately.
Another thing to keep in mind is that you can be strong and deal with whatever life throws your way. I know it doesn't seem like it but we humans are very resilient and we can handle a lot. Try to approach every situation with a bit of distance emotionally. Take lots of deep breaths. Do what you can and that's all you can really do. Try to stay away from the junk food (which you're already doing and that's great) because it will only exacerbate your difficulties.
I can only offer this advice in regard to the parents: talk to them about the junk food and ask for their help. If they aren't willing to change, then try to stay out of the house as much as possible. Keep yourself busy and away from the kitchen.
First goal: under 180:
Second goal: 175 or below:
Third goal: 168 (no longer overweight):
Fourth goal: 160 or below:
Final goal: 145-155 (not sure if this will ever happen):