Welcome and I'm sorry for what you've been going through.
30 was my magic number as well. I'm 31 now and in the last year, the longest I went sober was 88 days. Even though it isn't extraordinary, it's better then I've ever achieved before. Turning 30 wasn't what did it though, it was really awful things happening in my life that I kept doing to myself. It was blaming everybody else when I was the common denominator of the problems. I am the problem and have nobody to blame but myself.
It's been almost exactly a year since these horrible things happened to me and the journey in a year has been miraculous. People close to me know I've struggled but also remind me where I've come in ONLY a year.
You've been doing the same thing for years, how are you going to break the cycle at the 4-5 day mark? When those cravings will likely hit you? What will be DIFFERENT this time?
Saying you will do it is one thing, acting is a whole different story.
Welcome to SR, use it regularly if that's your thing, I wouldn't have learned as much as I have without the wisdom here.