Go find and read some articles about neurogenisis to feel better? Seriously though, as a young adult I bought mephedrone analogs from RC vendors at one time and then later saw all the wild claims of brain damage and inability to sleep afterwards.. Relax, you are still you, and you're okay. It's not the end of the world.
And know that the brain has a massive potential for change and repair. It takes some pretty serious damage to see permanent issues. Most things will go away over time
