oh my goodness, crystalrose, ANYTHING can trigger a mood change. something you ate, something you saw on TV, something somebody said to you, something somebody DIDN'T say to you, the way somebody looked at you, the fact that they DIDN'T look at you, where you are in your menstrual cycle, the season it is, the time of day it is..................

see, anything.

it's a good idea to keep some kind of a mood diary & perhaps list what happened just before your mood changed - maybe you can get an idea of what triggers YOUR mood changes.
susan