Well if you are there with him and soothing him it is not CIO... I think CIO is more when you plop him in the crib and leave the room... like "okay, I can't deal with you and so you're on your own".
It sounds like maybe he is gassy, or just fussy. I don't know how old he is and so it is hard to say. Do you have a big yoga ball? I know that this always worked for us when our babe was young, and gassy and just couldn't settle down. You sit on it and hold the baby and bounce and bounce and bounce
If you don't have one, or that doesn't work - I'm sure you have tried most of these, but what about walking in a stroller or driving in a car? A warm bath, or a tummy massage?
I think sometimes if a baby just needs to cry to let the stress out (which IMO is a real thing) it is a different kind of cry then the "oh my gosh my tummy hurts" cry... in which case the bouncey ball won't work as well. My baby only had to do this occaissionally and not every night.
Good luck.
Nancy
It sounds like maybe he is gassy, or just fussy. I don't know how old he is and so it is hard to say. Do you have a big yoga ball? I know that this always worked for us when our babe was young, and gassy and just couldn't settle down. You sit on it and hold the baby and bounce and bounce and bounce

I think sometimes if a baby just needs to cry to let the stress out (which IMO is a real thing) it is a different kind of cry then the "oh my gosh my tummy hurts" cry... in which case the bouncey ball won't work as well. My baby only had to do this occaissionally and not every night.
Good luck.
Nancy