I have just been through this and all the calming and me holding him didn't help. I needed a break so I left him in his cot and walked out of his room, and he cried for a few minutes and then fell asleep. I think he needed a break from me as much as I did from him. I've noticed that he sometimes just needs to cry it out for a few minutes without an intervention. It all takes time to work out doesn't it. Bath always works for us too.