I had a similar situation when I first started up with a young one (6 months) and honestly the best thing I invested in was an Ergo Carrier. I back carried him during the cranky moments. He found this soothing as he was held snugly and the movement also calmed his body enough for him to stop crying entirely (and even fall asleep sometimes). While I understand that carrying a child around isn't ideal, I had to remind myself that he was only 6 months old and this stage was luckily short lived. Now he's a very well adjusted little boy and we have a wonderful bond/trust. The carrier itself was very comfortable and allowed me to free my hands and move around for the other children.

I know how quickly a cry like that can drain your nerves! Best of luck.