Wife / Girlfriend rage
If this is a pattern that you've seen the whole 12 years it likely won't change (although with good counseling it might), but if this is new behavior check out new medications and have a medical check. I won't go into too much detail, but you should have seen my wife when she was on the "pill"...then what the anti-depressants did...I could go on and on about how the medical community has wreaked havoc on the public...