wildflower you are absolutely not alone. I know the fear is real and I (and most of us) have been where you are right now.
First great bit of news is that you've made a commitment. That's huge.
I would just make sure you have no alcohol in the house and if you have get it tipped away.
Your only job is to look after you. This is utterly important.
Whatever it takes to get though today please do it.
Drink lots of water, rest, read and post on SR, call someone to sit with you if you're frightened, see a doctor if you feel it's necessary, eat little and often, drink water again, rest again, etc etc.......
The pain of withdrawal does pass.
You are not alone and we can hand-hold you through each hour or minute as necessary.
Take care xxx