It is not possible. You can't activate an ability based on your debuff status. For example, when you use Escape Artist, there would be nothing to prevent you from also using Berzerker Rage. If you're snared it has no impact on whether or not you can use Berzerker Rage. Additionally in the context of a PvP trinket which would break any effect, there is nothing to prevent it from being used at any point, even if you're not afflicted by anything.
It's not functionally possible to say "if I am feared, use this". Debuff/buff status can not be tested in determining the execution of an ability in a macro.
"In anything, if you want to go from just a beginner to a pro, you need a montage." /w TankSpot WTB Montage for Raiders.