DS screamed too, a lot, and at times there seemed to be nothing at all that could help him. I feel your frustration,it can be so distressing.
When he had colic we would rest him (belly down) on an arm, gently rubbing or patting his back.We have one of those fitness balls and we used to use it frequently to settle him. Just holding and gently bouncing seemed to be one of the best ways we found to stop the screams.