I can not tell your for certain if your brain will go back to not being so anxious, but I'm pretty sure it will. It is very normal for it to take a while to "normalize" your mind and body after a heavy bout of drinking. The tough part is getting through a week or two so you can start to feel normal again. Other people will be along to offer their advice.
If possible, I advise trying to eat at regular intervals and drink Gatorade or something that will help restore your electrolytes.