T., good for you for at least wanting to try the "cry it out" method. My boy (now 8) slept through the night wonderfully at an early age. All of a sudden he began waking up in the middle of the night. Of course at first we'd go in and check on him, check the diaper, try to feed him, etc. But after a couple days, I took him to the dr. to make sure there wasn't something else going on. After the dr.'s "all clear," we let him cry it out. It may have started innocently enough - maybe something startled him or maybe there was teething pain, but if they get used to that "schedule" they'll come to expect it, at least for a little while. We let our son cry it out and honestly, it only took two nights at the most (I think it was one!). Of course, my husband and I agreed on this method so I'm not of any help in that area. Maybe you should all go to the Ped. together and hear what he/she has to say and go from there? Or let him get up with your son!
My son & daughter both stay in their beds at night now (5 & 8 yrs.) except for the occasional bad dream, or to go potty. I don't feel like I missed out on any "cuddling" time with either of them. After all, when I get woken up, I'm not usually in a happy mood! Knowing everything was fine, I mostly wanted my baby to go back to sleep so I could go back to bed!
Let us know how this works out for you & your husband!
Love & Prayers - B.