Hi Butterfly,
I just read all your posts and cried the whole time. I'm in the same boat with my DS who is 5 months old. He is a 45 minute napper and wakes frequently at night for me to sh/pat him and reinsert the paci. I've reached the point where I become physically sick to my stomach every time he cries during a nap and especially in the middle of the night. I consider CIO everyday now but can't bring myself to do it. I was spoiled with my first DD and thought the BW was the reason but I've come to realize that all babies are different no matter how much you try to establish a routine.
I don't have any words of advice as I am going through the same thing but I wanted to let you know that I (and I'm certain many others) share your pain and frustration. I`m still holding on to the belief that it WILL get better. It`s clear that you need a break, though and don`t feel bad if you need to take her in bed with you. Keeping your sanity is more important and really, at the end of the day, there are far worse things one can do as a parent than the occasional co-sleeping! Besides that, your perseverence shows what a dedicated mom you are!!
Hang in there...