Hey Scram,
You are not alone. One of Dr Phils books that I read actually mentioned 10 years as a benchmark for bad habits is common.
Start again today. I'm only on day 10 again, but know that this is it. What I'm learning is that the fear of going without is much scarier than the reality of going without. Everything is so much better on the other side. Try not to focus on what didn't work in the past. Come up with a realistic plan and keep it at the top of your priorities every day. Every morning when I wake up with a clear head I go through the things I am grateful for to begin my day. I have to remind myself often during the day not to let daily stress change my thinking. That's usually when I jump on SR and strengthen my commitment.
You can do this!