Hope you're doing good too. I actually survived taking some SN a few days ago, although I only took 5 grams so I'm not sure if it'd be different if you took the recommended dose.
There's not been any reports of brain damage from a failed SN attempt. I don't see any permanent damage in my case, either. Back to normal after a day- it's unpleasant, kinda like a really bad hangover, but nothing serious from the looks of it. Once it's out of your system, most people seem to get away with no lasting damage. I saw one person on here with heart damage from their SN attempt but that doesn't seem to be a common thing. Still though, don't fuck with SN. Don't take it unless you're serious, and when you do make sure to follow the regime and you don't have to worry about failing in the first place.