I had same problem with my ex.......
I agree she needs a counselor. My ex left me and she just started seeing a counselor and the counselor sent her to a psych because she coudn't prescribe the anti-depressants or not ones that were strong enough. Same type of behavior with the blowing up over trivial things and directing her anger at me. My luck the anti-deppresants will work and I spent 7 years while she was a bi*c* or I mean, angry person at times. Mine even tells me that it isn't very fair to me that she is in counseling and on medication after spending 7 yrs with me and not working on herself at all even though I had asked her and even said I would go with her if necessary. That is the part that kills me, what if she is happy now with the new guy and thinks all the unhappy times were my fault? Nothing I can do about it but it sure sucks to think about that. So try to approach her with it just so you know you tried everything to salvage the relationship.
What does she say if you tell her you think she is over reacting and it's not the end of the world or nobody got killed during these outburst and hug her? Mine would push me away if I tried to hug her and say it's ok, nothing we can't fix or whatever. I am curious how she reacts to that type of action or communication from you during these outbursts.