Twice in two weeks. Wow. I would, if I were going to represent you...and incidentally, you desperately need a lawyer, even if you are going to throw yourself on the mercy of the court. This is a life changer, so invest the money, even if you have to really dig for it. But anyhow, if I were representing you, I'd strongly advise you to get yourself into some sort of a and d treatment BEFORE you go to court. This will show you acknowledging a problem, and being proactive about taking responsibility and trying to make sure it does not happen again.
If you go in representing yourself , take no responsibility, do not agree you have any problems and try to argue these silly things like, "Well, I've known other people who got off on charges like these" and "But he told me I had passed my other test" you're going to be stunned by the reaction of the court officials. They've heard it all before. This wasn't bad luck, you have a drinking and driving problem.
However they are supposed to look at it, being human, judges often perceive that people who refuse these tests are first of all, guilty and second, think they're smart. They tend to really come down on them. As Ron says, he's seen some lawyers prevail, but I bet he hasn't seen a lot of unrepresented clients manage it.