Great question. And yes, you could be bipolar. Bi-polarity comes with emotional AND cognitive changes, often resulting in the type of outburst you describe. Typically, these outbursts are seen more prominently in bipolar children, but adults can have similar manifestations (more rare, but not unheard of). In other words, the emotions begin to leap out of control, but the cognitive processes that are typically employed to curb the behavioral episodes are also re-routed, thereby leaving the emotion to run unchecked.
Another possibility is a rarely-used diagnosis called Intermittent Explosive Disorder. There is some debate in our field as to whether this one exists or not, as it seems to fold nicely into the the broader "Bipolar" criteria. Still, it remains a diagnostic option for now.
Realistically, there is not much difference between the two as far as treatment goes. Mood stabilizers or atypical anti-psychotics will be employed (on occasion, anti-seizure medications can also be used). Talk therapy is recommended to deal with some of the self-talk that leads to the guilt and shame you feel after an outburst, and with the trauma that is possibly adding fuel to the fire.
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