Firstly, CONGRATULATIONS!! So exciting. And welcome to B and B!
Secondly, I'm sorry that you're feeling so overwhelmed, but it's understandable when you lay out all of your concerns. If you consider them one at a time though, they are all a lot less scary than they might seem combined.
RE: You've been drinking - You are not so far along that you need to worry about that. The week after I (unknowingly) conceived my DD I was at a wedding in France and it was non-stop drinking...but my DD was fine. The important thing is that you don't drink too much alcohol from now on, and you aready know that so you've got it covered! NOTHING to worry about.
RE: Folic acid - Again, plenty of people have no idea they are pregnant until 8, 10, 12 weeks along and they are able to have pefectly healthy children. Start taking folic acid now and you'll be fine!
RE: 19 month old - Me too! We should stay in touch because we'll probably face some of the same challenges. When I had DD there was a woman on the same ward who had just had baby#2 and baby#1 was only 4 weeks old when she conceived! If she can do that, we can do this!
RE: Traumatic labour, birth and early days with your 1st. I had a similar experience (4 day labour, back to back, forceps delivery, then we both became ill and had to go to SCBU). I found it all so traumatic that I actually developed post-traumatic-stress. I'm fine now because I made an appointment to see the head-of-midwifery at the hospital where I gave birth and she went through all of my notes with me and talked the entire situation through...it really helped my brain to process what had happened and put a lid on the events instead of reliving them. She was also able to tell me that the things that went wrong were pure chance and there was no reason to think they would happen again. When you see your mw for the first time I highly recommend confiding in her that you are nervous about this labour because you had a difficult first labour - she may well be able to arrange a meeting for you so that you can go through your previous notes and ask the questions you need to ask.
RE: Not knowing you were pregnant this time - every pregnancy is different and having less obvious symptoms this time does not mean that something is wrong. Also, who is going to notice symptoms to the same extent when they are busy getting married, going on honeymoon and have no inkling that they might be pregnant?!
It's obviously come as a shock and it sounds like you just need some time to let it sink in.
We've set up a group for those of us due in June 2011, feel free to join here
http://www.babyandbump.com/pregnancy...buds-come.html
Lx