You will feel better, I guarantee it, one day at a time. Lots of water & rest.
Don’t hold back on food; you can expect cravings (it’s replacing those alcohol sugars). Don’t worry about food, just eat what you want, when you want. Your diet will settle out after you get some sober time.
Join a recovery program of some type so you can get support & not feel alone. There’s a bunch listed here & many have online options:
Resources for our recovery