I think identifying triggers and having corrective measures up your sleeve takes a real amount of experience, and probably therapy to teach you to cope with these things.

I've come to realise that certain things trigger me, but I cannot yet put a list together.
I'm beginning to realise when my anger and frustration is "normal", and when it's me over-reacting due to the BP.
The next step will be to learn coping mechanisms.
But this all takes time, so I have no option but to wait.