Hi, I'd like to help you with your question.
It sounds like your partner has anger issues. She also does not seem to see this as an problem since she is willing to treat you the way she does and not try to make amends. The lack of insight makes it difficult to resolve, since she needs to recognize she has a problem before she can work on it.
You are right, this is abusive. Making you leave the relationship (and the home) every time she is very angry is inappropriate. It is also emotionally abusive. Needing time apart after an argument is ok, but not to this extreme.
What you can do all depends on whether or not your partner is willing to work on this issue. Does she seem willing to talk about why she gets so angry? Is there something in her background that triggers her outbursts? A childhood spend witnessing abuse or extreme marital problems with her parents could be a factor. Getting to the root of the problem helps her put the feelings where they belong, in the past. So when she gets angry, she will know why and be able to diffuse it faster.
Since she is a therapist, she does understand the need to seek therapy when you are faced with an unresolvable problem. Suggest to her that you both go to therapy to work this out. Choose a therapist that she does not know or has not heard of. It is better if she has no influence while in therapy. There is too much risk that it will create an imbalance of power in her favor and therapy will not work.
She also can find a way to stop herself from becoming so upset she loses control. Use a signal or some type of agreed upon sign that you both agree on that will help her stop and remove herself from the argument before she gets too angry.
However, if your partner will not see her anger as an issue and will not work with you, you may have to decide what you want to do about the relationship yourself. Before you decide, you may want to seek counseling yourself. You can get a referral through your doctor, or if you attend church, your pastor could help. You can also search on line at http://therapists.psychologytoday.com/rms/.
Seeking counseling can help you be sure that you are making the right decision for you. You do not want to leave the relationship with doubts about whether or not you made the right choice.
Let me know if I can help in any other way,