Joy, I really appreciate you sharing your struggle with us. As you said, you already know that it gets better, the constant cravings fade away, and that sobriety is a great place to be. The 100 day challenge sounds great. It gives you plenty of time to think and consider.
When I started this time I was in Annie Grace's 30 day challenge. I liked it a lot and it did a lot for me. I admit I quit logging on after about a week. I think I honestly just forgot about it. I was doing a lot of other recovery things, though.
I hope it gets so much easier very fast for you.