Hey OP, sorry to hear you're having such a hard time. I totally get you because I've been worrying about the silliest things. As an exemple, I worried because I sat in the bath with my son for 30min before I remembered that hot baths are not advised in pregnancy (even though there isn't much data to confirm this and people in finland who regularly have saunas don't have more birth defects than other countries !)
About the drinking, pp's have done a great job at explaining why you most likely didn't do any harm. I'm actually a bit angry on your behalf. So many of these health in pregnancy campaigns try to rule through fear rather than educate women about actual risks.
I don't know if that helps but I read about a study that found that amongst women who drank a sustained high amount throughout pregnancy, most had healthy children (I seem to recall that only a third of the babies had issues, and the mothers had been drinking at least a bottle a day for the whole nine months !
In other words, even the most hardened drinkers are more likely to have a healthy baby than not. And you're not a "hardened drinker", you had three bouts of drinking in very early pregnancy.
Like pp's said, it tends to be an all or nothing deal so early in pregnancy. If you'd done any actual damage you'd have miscarried before now.
I really hope you're ok. I'm angry at the doctors covering their backs rather than giving you the reassurance you need. Maybe you should reach out to other sources of mental health support to help you gain perspective and worry less ?