(((Hugs))), that sounds really difficult. As you obviously know, sleep training shouldn't take that long, so there must be some other issue at play. Can you post what your daily routine looks like, i.e. when he wakes, when he naps, when he goes to bed? Does he have a history of reflux or any other intolerances? Is he currently teething? Does he go to sleep for naps on his own?
I'm going to move this thread over to the sleeping for toddlers board, since he will be 1yr so soon.