Can you get another doctor? Because I agree that threatening to hospitalize you is inappropriate. I shudder to think of what would have happened if some of the mental health care professionals I've come into contact with were "in charge" of my treatment.

If you don't have a history of questionable parenting incidents or reckless driving anyone calling those things into question simply because of the word "bipolar" is being discriminatory.

Also there is a condition called cyclothymia which is basically a milder form of bipolar, it might be worth reading about to see if that seems to fit better.