it sounds to me like you might be dealing with something like 'rapid-cycling bipolar', which can strike like lightening. many times people with a depressive disorder will experience rage as you described. i never like to suggest meds, but you might consider some of the milder ones, if you haven't already. i do agree with Skeezks, that many people have sustained a brain injury in childhood which went unrecognized, but has long-term consequences.