Sleepless you poor thing - you are feeling terrible and anxious and panicked and it is an awful way to feel and I can completely understand that you can't currently see any way out of this situation rather than a termination.
My doctor and midwife told me that the baby doesn't actually take anything from your body for the first few weeks - the placenta is not in place and functioning before then - so any alcohol you have consumed could have contributed towards the risk of a miscarriage etc - not damaged your baby with FAS or anything horrid like that.
There is a lot of nonsense on the internet about this subject and a lot of it is designed to make pregnant women feel guilty - the advice varies greatly depending on country too - really, the only advice to rely on is NHS advice and that given by your GP and your midwife.
You say there is 'so much evidence' but how much of this is actual evidence and how much of it is published on some nonsense website by non medical, poorly informed person with their own agenda to push? LOADS. In fact, most of it! You can find 'evidence' on the internet for anything if you look hard enough.
I really feel for you and hope that you can find the help and support you need over the next couple of days to enable you to make some informed decisions.
Pregnancy can be terrifying full stop, without all of these additional worries and anxieties and I really think you need to speak with someone who can help you with your mental health.
There is nothing to be ashamed of and you are not alone - I have had ante-natal depression and treatment for OCD and GAD during my pregnancy - usual symptoms of anxiety etc are exacerbated by the crazy hormones flying around.
I will be thinking of you over the next few days and really hope you can get some help and support to start to ease some of your fears and anxieties.
You sound very poorly lovely and I think you should speak to someone to try to unravel your anxiety issues before you make any big decisions about your baby. 