M.S.
Your son might be responding to the change in his routine of putting him in daycare, but it could be any milestone or teeth or ears, too. I would definitely recommend the Weissbluth book mentioned below regarding sleep in general. You could put a pack n play in your room or move your son's crib into your room as a transition, if you want to help your son feel your nearness without having him in your bed. When you are all together, make your family time worth every minute - leave the dishes, dinner, laundry, phone calls, errands all behind and just play together. This will probably help your son relax about the new routine and new people in his life.
My husband was also against the cry it out method, until we read about it together and then became absolutely desperate for sleep, when our son was 9-12 months old. The longer you wait to deal with a sleeping problem (even if you think it's temporary), the harder it will be for everyone to fix. When we tried EVERYthing else and had no luck getting our son to sleep, we AND our son had to endure more crying because we had waited so long to try "cry it out". It was the only thing that worked, it was the right thing, and then when we did it with our daughter (much earlier, around 6-7 months for bedtime), we hardly had any crying at all (less than 10 minutes, 2 nights). I'm saying this so if you think you're going to be headed for "crying it out", you should seriously consider doing it sooner rather than waiting.
Crying it out does not damage children. It is a very difficult decision for a parent to make, and it's not easy to do either. Those of us who make this choice do not do so lightly, we do not love our children less, and our children are not less attached to us. I let my own children lead me as a mom in many ways - my son was screaming at me to let him cry himself to sleep and leave him well enough alone. Once I got his message, he started sleeping 12 hour stretches and he became a much happier and healthier child. I hope something I've said is helpful to you. Good luck!!