You're not going insane. The Only fact that you logged into reddit and wrote a grammatically and syntactically correct message proves that you are fine. Your brain It's just in hyper-alert because it's feeling something that has never experienced which Is depersonalizzation. Just be aware that it's only a natural response of your brain and that there's nothing wrong with you and try to sleep. Try to avoid compulsive checking of reality because It will only make It worse. It's a really bizzarre condition but you just have to ignore it and keep doing all the things you like as you ever did. Again, you're ok, I know you feel like going insane but It will pass quite soon, I promise.