If you phone the Hotline as suggested above, it is very likely they can arrange for AA ladies to provide help and transport. If you wait till you have money for petrol, it is likely you will have missed this window of you being willing to quit.
You know what we are like, the memory of vomit or how awful it was fades quickly. The window of willingness seems very small so that is when we need to act.
I expect you know this already but a reminder is sometimes helpful.
Wishing you well.