Your nervous system is likely fucked up. It takes time but will eventually happen. Anxiety is because your nervous system doesn't or is not used to operating by itself, it has depended on "whatever". It is basically asking " hey pocket, where is this substance you have been feeding us"
You bet is fucked up. Reason #1 I decided to stop doing coke all together. Rarely enjoy it these days, is like I love some parts of it, the first line and such, but most of the night is paranoia and restlessnes, and more anxiety. My dopamine system is clearly depleted, cocaine cannot and will not affect it positively anymore. To the contrary, working out and simply being with chicks doing whatever seems to elevate my dopamine levels naturally. I decided to substitute coke addiction for working out addiction, seems like a good trade. I am already jogging 3 miles a day. Afterwards I do 3 rounds of 200 abs, 50 pushups and 50 squats. Already lost 8 pounds in 2 weeks.
My body craved for coke the 1st week off, then... my mind sometimes makes me feel like I want it but at the same time I'm so disgusted by it, it quickly wears off and I find myself distracted of the craving. I used clonazepam and similar sedatives in the past to catch some sleep after a party night but it was a very dangerous combo, so I stopped. 2 drops of clonazepam are awesome for a deep sleep, but I guess then I would become addicted to that shit too.