Our DS2 was exactly like this and after DS1 who never did it, we were starting to go crazy! Two things ended up working for us (after trying Infant's Friend, Infacol, Brauers Colic Relief) was a trip to the Chiro, the best thing ever!! Next baby we have will be going in the first week! He stopped the screaming two days after the first visit to the Chiro.
And also getting him into bed in a dark room before he got cranky, so if I knew he would start around 6pm I would get him ready for bed and sit in the rocking chair while feeding in the dark at about 5:45pm.
So I think he was uncomfortable and very overtired by that time of day.

Hope that helps in some way and I hope it passes very quickly for you, its horrible.