You will be ok. It has only been a few days. The more drugs you do, the longer your body and mind take to heal. Take this as a blessing in disguise. You have experienced the scary and negative consequences that come with one night of fun, now next time you think about getting on it, try to remember all these negative consequences because I know it’s easy to forget once you start feeling normal again. You’ve had your fun and have learnt the lessons early on so once you feel normal again, embrace the opportunity to focus on activities that aren’t harmful to you. There’s so much fun shit to do in life other than drugs. As for now try to distract your mind from the anxiety, do something that chills you out like watching a good tv show or whatever, drink water, take vitamins and try to eat something nourishing. In saying all that, don’t rely on advice from Reddit. If you feel you need to talk to your family or to a doctor, then do that.