Is this psychological abuse? Should I switch supervisors?
You write that your advisor said that you &quot;committed severe ethical violations.&quot;  But you don't say anything about what specifically you did, whether the accusations are true, or how you responded to that accusation.  We simply cannot give you good advice without knowing more about these violations.  Honestly it sounds like you don't understand what the accusations were, which is extremely worrisome!
It's sadly common that there are advisors who are abusive bosses, but this is not one of those common situations!  Either your advisor is completely disconnected from reality and is making up ethical violations, or you are a serious danger to your research group because you commit bad ethical lapses and don't bother to understand what you did or how to avoid it in the future.