Welcome back !
Day 1- Ugh. You got that right ! WD is no walk in the park. It took me a good week to not feel sick, two weeks to feel OK, and a lot longer to feel human again.
Anyone ever use meditation to help with quitting / anxiety / stress?
"Sought through prayer and meditation to improve our conscience contact with God as we understood him....."
Step 11, aside, my sponsor mentioned breathing meditation. Google it. It helps a lot. The first time I tired it, it was (to me) about 3-4 minutes, but looking at the clock I realized 30 minutes had gone by ! It's really relaxing.
You've been here before, you know that anxiety is part of early sobriety. There is no quick fix. Just do what you can. exercise, eat well (when you finally can), limit caffeine and nicotine intake, etc....
Hang in there, it gets better.