I have a 6.5 month old girl who was exclusively breastfed until 6 months. She has had her rough moments with sleeping, too. I actually LOVED the book "Healthy Sleep Habits, Happy Child" for the fact that it gives lots of different techniques that can work with various parenting styles. I never thought that it advocated one method of sleeping.
The one thing that it does recommend for all types of parents is to set up some kind of routine for sleep times. This means, however you decide to put your child to sleep, do it consistently.
Our naptime routine works like this: diaper check/change, drawing the blinds in the nursery so the room is darker, sit in the rocking chair, rock and sing to the baby for about five minutes, into the crib she goes, turn on the baby monitor, and I leave the room and close the door behind me. She usually fusses, and especially when I first established this routine there was a lot of angry fussing, but now she knows what's happening. Initially I would nurse her before sleep, too, and while I still will do that, especially if she's overtired or really worked up, I am working on getting away from nursing her to sleep every time.
I have found with both my girls that drawing the blinds when it's time for sleep, and opening the blinds when the nap is over is a powerful visual cue for a child. I'm very consistent with it, I do it every time, and while it doesn't make the room pitch black, it makes a very noticeable difference, and I have found that to be an important part of the routine.
At bedtime, we add a bath, a story with her big sister, an extra feeding, and definitely a nursing into the routine.
It's the routine that makes kids learn to sleep. It can involve crying it out, not crying it out, and anything in between, but you have to be consistent so that the kid learns to be able to tell when it's sleep time.
For me, now I have a child that sleeps great in her crib. Although, she will ONLY sleep in her crib. Oh, well. Once you get a strong sleep routine established, you'll be able to use that same routine in a different location, too.
One more good thing about HSHHC, it has a good chapter for parents of colicky kids on what to expect from them sleep-wise, and it also has good guidelines on how much sleep to expect from a child. I've found that incredibly helpful with both my girls.
Good luck! I hope you can start getting some good sleep soon!
~ E.
PS. One more idea: My daughter was reflux-y at the beginning too, and what I found worked for her was to have her sleep on her tummy. I know, I know, but even in the Dr. Sears Baby Book it says that babies with reflux often sleep better on their tummies. Even when my daughter had to be in Lucille Packard for 24 hours, she slept on her tummy, and the nurses didn't bat an eye once I explained it to them. Remember, when we were babies, our mothers were instructed by the doctors to put us on our tummies to sleep. Wherever the kid sleeps best is the right way for them to sleep. Plus, pretty soon your daughter will be able to roll over and choose her own sleep position anyway! :)