Yes, there is truth in what you're saying. I think the difference is the way I compartmentalize negative and positive emotions. I can't or don't access my negative emotions until all at once they hit me and I become a completely different person. And often don't recall what I've said when it's over.

More clinically:
Splitting is a defense mechanism used by people with borderline personality disorder (BPD) to deal with difficult emotions. It's a common symptom of BPD and other mental health issues.

Splitting causes people with BPD to view things in extremes, such as all good or all bad, with no room for complexity. They may have difficulty accurately assessing people or situations, and their views may switch rapidly. For example, a person with BPD may view their partner as the "worst partner in the world" one day and the "greatest partner ever" the next.

Splitting episodes can last from a few hours to a few months, or even forever. They can be triggered by stress and anxiety.