Sleep...what is that??

I want to start out by saying (and I've said it many times before), thank God we had our twins first because I think they truly broke us in for what we would be facing with Kale!!! Ana was a crier as a baby and was the child to wake up the most during the night - but Kale tops that by 100 times! For about two months now (since we took his pacifier away) he has been waking up every night between 2-6 times a night! YES, I said SIX. Before we took his paci away, he would sleep through the night and really only wake up if his paci would fall out of his crib. SO, I thought, maybe if he had something in his crib that made him feel secure it would get better. The first day at nap time I asked if he wanted to take a toy or anything to bed with him and he chose one of his little tractors, and believe it or not, he only woke up once!! So I allowed him to do it again at bed time - this time his tractor was a little bigger, but I let him because it worked at nap! And holy cow, he slept the whole night!!! I thought I was really on to something so the next day we did it again. By the time bedtime came, he picked his big tractor and manure spreader...it was tough to find a place in his crib for it, but I did it. He slept pretty good until the tractor got in his way and woke him up. Since then, it doesn't matter what he takes to bed, he is back to waking up over and over. Believe me, we have tried everything - night lights, letting him cry it out, laying beside his bed until he falls asleep, rubbing his back, etc. Anyone who has any suggestions - we would LOVE any of them!!!