Hi there. Firstly big hugs. We are always hardest on ourselves.
Drinking is risky - you already know that But the fact remains there is nothing you can do now, except prevent it happening in the future. I agree with Brontide that you need to see someone to talk through how you are feeling. It sounds like there are quite a few issues you need to talk through. Seeking help does not reflect badly on you - everyone feels out of their depth sometimes and when you are pg or even after baby is born all of these new feelings develop. Would you think badly of anyone else who needed to see a counsellor? I consider myself to be a well-educated, well-adjusted person with a reasonable support network - I had ante-natal and post-natal depression and had to see a psychologist/dr/counsellor at both times. Now is the time to get some help.
Secondly - yes drinking can be very dangerous to your unborn child but what about the dangerous driving your partner showed? I would be furious over his lack of regard for you child's wellbeing. It was very irresponsible.
Good luck with it all and big hugs.