I am so sorry that you are having a tough time.
First of all, can I reiterate the most important advice given above, don't drive around after a few drinks. To be blunt, you feel **** enough about yourself as it is, without getting stopped for drink driving or, even worse, hurting someone.
Next step, go and see your GP.
Tomorrow.
Pick up the phone and dial their number and make an appointment.
When you get in there, explain how **** you feel and be prepared to break down. Don't be embarressed or worried or ashamed, again, to be blunt, they seen stuff that makes your depression look like a walk in the park.
Do that and you're on your way, its a journey, thats your first step, and let us know how you get on.