E.C.
Hello T.-
Long time since we talked, but the only suggestions I have are to try a soothing cd in his room on really softly and to try a somewhat modified cry it out method. I did both with my daughter and they worked great. As soon as I stopped rushing in her room when she would cry I would let her cry and she would soothe herself to sleep. I started off slow like 4-5 mins and then would gradually increase it as time when on because I knew she could soothe herself to sleep. Hope these help! Stay strong he's at the age now that he knows how to get you to come running to him. It's hard to hear them cry, but it does work and evetually he won't fuss at all when you put him down because he will know the routine.
Take care!