just don't know what to do...

I just don't know what to do with my baby girl.  Brynna is ridiculous.  She's bipolar.  She's so sweet and loveable, but when she's mad, there's no reasoning with her and no stopping her anger.  As I type this, I KNOW that she's me....and I don't know how to discipline or change her.  She doesn't respond to time-outs, spanking, yelling, etc.  Lately she's become even more aggressive than she already was.  She has put her hands around Caleb's neck in a choking motion on two occasions.  She was so pissed off this past weekend that she pinched my arms and would not stop repeating her irrational demands no matter what.  Her fit lasted a good half hour or more and there was NOTHING I could do to stop it.  I need to do some research on how to deal with her...gosh.  Payback is a bizatch and I'm going to remind Brynna of that ALL the time when she's older.  She better pray she doesn't have a daughter.  :-)