Sleepless, I feel for you, I really do. But you're torturing yourself. You're being completely irrational about the scale of the 'problem' of your drinking. You think you won't 'be so lucky' as the other people who drank (and some just as heavily as you) at the start of their pregnancies and had perfect babies.
Let me tell you about someone who wasn't lucky at all. My sister. She didn't drink (her baby was conceived in a Muslim country) at the start of her pregnancy. She gave up caffeine, cheeses and all the stuff pregnant women should not have. She was a 'perfect' expectant mother. Perfect. Except at 32 weeks her baby died. She had done everything right, and yet her baby still died.
Let me tell you about the wife of my husband's friend (I can't call her a friend for obvious reasons), she drank heavily throughout both her pregnancies. She took magic mushrooms during one of them. She smoked cigarettes and cannabis. Now she has two healthy and well-well-adjusted children.
What did my sister do to deserve her fate? Why was the other woman so lucky? Who knows? But at the end of the day, what will be will be.
You want your child. You just don't want any problems it has to be your fault. But, they won't be your fault! You didn't know you were pregnant, so if (and I think your baby is fine) your baby has alcohol related problems then it is still not your fault.
Get the psych help you need, bang down doors and don't give up.
Stop thinking a termination will be the answer, it won't. It would give you more guilt and pain.
Pregnancy and motherhood is full of anxieties and worries, but all you can ever do is try your best.
Stop looking online for answers and start speaking to professionals in real life. I wish you well. Xxx 