I do get stressed easily and quite often.
I notice it when I can feel my blood pressure going up as slight ache occurs at the right shoulder. At other times there is a feeling of acidity in the stomach suddenly.
The sure trigger is when I see a terminally ill cancer patient in pain, for which I am unable to do anything and I cannot run away from the situation. I have to sit and talk. It is actually the realization that my talk is useless, which I figure is the real trigger. I get stressed in other situation too, like when I see people in avoidable heated arguments, fighting, road rage etc.
Most effective solution that works for me is sleep.
I also spend five minutes everyday doing "trikonasana' which keeps my blood pressure under control without medications. However I make no recommendations about it.