S.,
Stop kicking yourself around about having caused the autism. While drinking could cause FAS, it does not cause autism, and you did not fail to interact with him enough, and if you did, it would not have caused autism either. While neither one of these things is ideal, they also do not cause autism, so you can put that to bed and never think of it again.
You got very good advice about therapy, so get him into a program now, as it is exteemly lucky that you have a diagnosis at age 2, so take full advantage of his early age and get him ABA, speech therapy, and OT as soon as you can. Call a speech therapist and an OT in your area and make the next available appointment. Because he is only 2, the state early intervention program will be available but be ready to transition to your local school district at age 3. You need to contact them early and find out the process so that you can have him evaluated by them at the earlist time, and get him started in a public education program.
The state will evaluate him (both for the ECI program and for school based programs) but do not count on the state to tell you everything you need to know. If you do not have a full evaluation by a Developmental Pediatrician, call on monday at your nearest childrens hospital and get him an appointiment, still go through with the speech therapy and OT while you wait for the appointment. You will get a report from the developmenat pediatrician that contains every kind of professional opinion you need and a treatment plan that will tell you exactly what you need to do. You should never count on the state to tell you what you need for your son and you should own the report that contains his diagnosis. Use the public services and advocate well, but supplement that program with as much private service as you can afford. Public services are only legaly obligated to make him functional, and you want more than that. Some may go beyond the lowest legal requriement, but you need to know what he needs so that you can decide what is enough.
You are not alone. Your feelings are just what all of us in your shoes have felt, what you have to do now, is to take that frustration and turn it around into action to help him. It is how it is, and it is a hard road, but once you get him into therapy and in an appropriate eduational program, he will progress. You probably cannot teach him these things on your own, and you will need help from trained professionals in a multi facited program. It is intense training.
My hunch is that there is a more appropriate place for him than a regluar day care, because he needs a theraputic enviornment, so do some inquirey and make some phone calls on Monday to find out what is in your area. You can read about services for autisic kids and learn about the kind of advocacy you will need to practice at www.wrightslaw.com. There is much for you to learn.
Take care of yourself too. If you begin to feel hopeless or overwhelmed, get help from a pschiatrist. Most primary caregivers need help at some point because this is a very difficult journey. There is nothing to be ashamed of if you do, and you will be in good company.
Get him some early intervention, and don't beat yourself up. It is not your fault, you are not alone, and you can't dp this on your own without a lot of help from professionals. Most of all, let go of the past. It's over, and you have much to learn, much to do, and you will need to be completely in the here and now to do it! May people will not see how far you have come, but you will, and you will learn how to accept his challenges and be happy.
Hugs,
M.