My Wife Left Me Today -sucks

Change the locks, get a lawyer and star seeing a therapist(see them enough and when the time comes they will sign a note stating that you are a sane person). Get your ducks in a row and don't get screwed. It sucks but you have a son and have to protect him. It'll get better but it'll take less time to get better if you protect yourself and your son from getting screwed over.