You have my son's twin!! UGH. I truly know what you're going through. When my son was that age, I was 6 months pregnant with #2 and working full time (with excellent help from my husband though) and was at my wit's end. I skimmed through the other responses and have 2 thoughts: YES, READ the Weissbluth book! Saved my life (didn't start until 8 months old and it still worked wonders). My other thought, which you're probably not going to love me for: neither of my kids slept through the night until after 12 months. I don't know why, could have been the many illnesses/ear infections, could have been my son's celiac disease causing him pain before I knew he had it, could have been my daughter's snoring problems, who knows. But it also could just be that my kids just plain weren't ready for the 11-12 hour stretch until later. At 9 months, the only promise is the MOST babies should be able to go all night without needing food/bottle. (And this WAS true for my kids). Hang in there - you will feel like a new person with newfound happiness once you get some more sleep.
Oh, and yes, we did cry it out. Reluctantly, after we tried EVERYthing else. And I mean everything. Letting the kids cry took 3 days for my son (who was 9.5 months when we tried it) and 1 day for my daughter (who was only 6 months). Letting your kid cry might be hard, but it's not cruel and horrible or abusive. Teaching your child to soothe himself and learn excellent sleep routines and habits is a life long blessing for him.