abadoo, for me baby sleep training books are a bit like weight-loss books. They hold out a promise of a wonderful life and then leave you feeling like a failure after you, predictably, do not achieve it. Only they are worse than weight-loss books as they are not about trying to change yourself but another whole person. And No Cry Sleep Solution, in my mind, is a pretty bad offender. I particularly minded the rather smug statement at the end of it that said that "if the methods in the book are not working for you, you are doing it wrong". The "no cry" bit is also incredibly misleading. How many people who used the book actually managed to have no crying at all?
The premise of the book is that you can change a baby's behaviour by gradually sneaking up the changes on him or her. The problem is that some (many??) babies are either rather observant or attached to their routines, so they do notice the changes, however, small, and put up a resistance. Here, after reading lots on MN and living through 19 months of my DS's life, my favourite approach is a cost-benefit analysis or "is the solution going to cause more pain to both parent and child than the problem?"
So if you are really shattered, then perhaps making your baby cry a bit is justified. The baby will probably sleep better for it and be in a better mood as a result anyway. I am not suggesting CIO or even controlled crying, but something a bit more radical than the "Pantley pull-off".
From my experience and from what I hear from a lot of other mums, teaching a baby to sleep without boob in the mouth is important. So perhaps you can work on teaching your DS to fall asleep without boob entirely. I had the same issue with my DS. He was (and is to some degree now) a horrid sleeper. At around 7-8 months, I started inserting book-reading between the bed-time feed and going into the cot. There was a lot of wailing and gnashing of teeth from DS, for days, but I held him, cuddled him, rocked him, basically did anything I could not to feed him right before going into the cot. And he did start sleeping for longer stretches.
But of course then he got addicted to being rocked, I made three unsuccessful attempts at night-weaning, he hit a horrid 9-month sleep regression, then improved, then hit another but thankfully smaller one at 18 months, etc., etc.. It's an ongoing struggle for sanity.