M.R.
I wish I had a good answer for you. We are in the same boat. My youngest slept great from about 6 weeks until 6 months, when he started teething. From then on (he's 19 months now), if he has teeth coming, he doesn't sleep well. In between - he sleeps great! I have also tried everything, but have had no success. My only consolation is that he only has 6 teeth left to go until those kindergarten molars.........