Well, I'm interested what do those people think who suggest OP to smoke and say it doesn't destroy your brain cells ? - Hell it does, smoke it for a year non-stop and you'll end up becoming a zombie.
OP - bk70 and others are right, maybe your mind is full of thoughts but make sure these thoughts are not negative, if they are, try to relax in other ways than drinking, smoking or any other way that can help you for a month but make addictive for the rest of your life. I personally think that you need to go out, take a vacation, visit some nice places with your kids, talk to people you've not seen for ages, all you need is to fill your body with positive emotions. Get off the fuckin PC, it's not worth if you destroy your health.