My suggestions would be to put him in bed with you and offer a dummy. My son loved to suck for comfort and would not settle unless in bed with is. He was in our bed for 3 months. Once I gave my son a dummy, he was also much happier to just be able to suck as he used to get frustrated at all the milk coming out.
My almost 4 year old has been jumping to my bed since DS2 is born, so I can't put him on the bed with me with the toddler. But I did co sleep with both my other kids. Maybe I should give dummy a go, he is a bit of a comfort sucker.