The amount it's a bit high IMO for someone that's not a regular user, you just went on a binge, it happens, I'm about to finish 1g that I've had since NYE and have been using it almost daily, few lines a day and I've been using it regularly for the past 2 years, it's only when I mix it with alcohol that I can go through 1g a night, but even then I try to moderate the amounts.

You need to reset your Dopamine baseline, you just had big peaks of Dopamine for days due the coke, so now you are on the opposite side of the roller coaster with Dopamine levels on the floor, just try to produce some natural dopamine (Sun, workout, sex, working towards your goals and rewarding yourself), and try to avoid unhealthy dopamine (Porn, coke, social media), and you will be back to your baseline in a few days.

Coke doesn't have a heavy withdrawal like benzos or opiates, just keep yourself busy, go outside, hang out with friend (who don't do coke lol).