It happens to some first-time users. It will go away, zweely. There is no other way to get rid of it than to let it go away through the passage of time. I assure you, it will go away. Once you've done it more, or if you decide to do it more, this will not happen. Normally you will feel completely sober 4 hours later. The intense part of the high usually ends after an hour, and you slowly start to gain sobriety after a couple hours. Of course, time is different for different people. But there is no way that you would normally feel effects for 3+ days. It's just your tolerance, and your first time experience. Just relax. Maybe drink a lot of water, or something.