Hey,
I can't give you advice from experiance, I can only tell you what I would do and what I think seems like the best thing.
Stop and think for a moment. Remember what happened last time when you found out. Remember how you felt. Remember what happened when you got the abortion, how you felt, how you still feel. I think that you should make your decision based on that....your feelings.
Honestly, I would not get an abortion just because the baby will be handicapped. Through my whole pregnancy, I would find out as much as I could about the handicap or handicaps and try to learn as much as I can so that I could be educated and prepared when the baby came. I would seek out a place that specializes in handicapped newborns, infants, and so on.
There is no doubt that this is going to be a long hard road and that you are in for the ride of your life, but just think about it. \"Why take a life away just because it's a little banged up?\" I heard that quote on a movie that is amazing. It was said by the horse trainer in the movie Sea Biscuit. I don't know if you've ever seen it, but there's a horse that has broken it's leg and can no longer race, so the owner is going to put it to sleep. This horse trainer comes and says he'll buy the horse because he knows it's not worth killing it. I know it's very different, but that quote has just touched my heart.
If you put your mind to it, you can definitely do it. There are tons of resources for this sort of thing to help.
You can do it! Let this child have life, even though he/she will have a handicap.
Remember, you don't throw a life away, just because it's a little banged up.
I hope this helps a little! Good Luck!!!! Take care