I lost all but 8 pounds of the pregnancy weight, both times. With one, I breastfeed 7 weeks, with the other, I breastfeed 4 and 1/2 months, so I don't think BFing really helps me lose weight, either. The only thing that BFing helped me with was not gain more weight, since I could eat pretty much whatever I wanted to and not gain anything.
Zephyr, I'm glad you're doing well. I tend to get backache later on, as well, except mine is usually upper back pain, which is not very typical for pregnancy pain.