My DD is almost 9 months and is also a ver poor sleeper. She's up 2-3 times per night, and naps od more than 1-2 hours TOTAL during the day are rare. She is up by 6:30am, and does not go to bed until 8:30-9pm every night. Days are long and nights can be longer. I too have suffered from the monster mommy thing at night, where when I hear her start, I just have to bite my tongue to stop from screaming!!! It can be very difficult to deal with the constant lack of sleep, especially when there's other children at home-I have a 6 year old son.
I stopped co-sleeping about 2 months ago, and that did give me about a 5 hour stretch- this is after she wakes once within an hour of going down, and only needs gentle patting to go back down. I find that if I put her in my bed, she wakes more than if she's in her room in the crib.
I also have no answers-I pray every day that "today" will be the day that she'll magically start napping consistantly and doing atleast a 7 hour stretch at night. I'll be counting the days till that happens, and when it finally does, I'm quite sure that I'll wake several times during the night wondering why she's not awake!!!!!