Actually, Psychic Scream and Berserker Rage are on the same CD. Although PS can be upgraded to 26 sec CD, you can also pop Death Wish (also to help your burst). After that, if you're both still alive, you can pop another Berserker Rage (no trinket popped yet).
This gives you 50 sec fear immunity... I hate to say it, but if you haven't killed him by now you're probably not going to.
The bubble's ****, but we have to suck that up... A bloodrage will help out with an early MS to pop it. DoT's will give you rage slowly, but other than that you just have to keep him in melee range and swing it.