I have only just read your post and the responses by others - yet you have not replied on this forum - although you may have done so privately.
I am so sorry that you have experienced such uncontainment - especially when you have had the courage to seek help for past traumas. Just reading your post, I immediately sensed your absolute rage at your experience. I also do not feel that you feel heard.
I cannot really comment on your therapist. However, I would not imagine that he intended - or I would certainly hope not - to to cause you more hurt. None-the-less, this has been your experience.
I agree with David and Melissa in that you should approach your therapist and tell him how you feel. Psychotherapy is your space to voice that which you feel and experience - not only in terms of past traumas, etc, but also in terms of your relationship with the therapist and the positive and negative impact.
The anxiety that you describe can be very restricting and debilitating. You have obviously a deep history of trauma and much respressed pain. Working through that in therapy can cause more anxiety and hence your therapy would need to be slow and containing to avoid you feeling choked.
I know you feel your trust has been destroyed. Part of your growth and healing is being able to admit and identitfy emotions - otherwise how can we gain control over this to evoke some kind of change. Your being able to speak out here and identify how you feel and express that in written form, is a begining to your journey to heal. Entering therapy is also part of your taking the first step into taking your life back into your hands (even though it may not feel like it right now).
There are many reasons for cutting. One of the reasons is that a person is unable to express - for example - their anger in a healthy way and feel so hurt that they cut (hence, pain and anger is turned inwardly to the self) - the cutting can also symbolise a getting rid of the inner bad - by bleeding outwardly. The cutting also may give you a high - feeling of relief and hence why it can be so addictive at times.
I would imagine that it took you tremendous courage to tell your therapist that you cut and I know that you feel your trust has been violated. however, you have already journeyed 5 months with your therapist. Its not easy to go to another therapist and start all over again. If you are able to continue with this therapist, then perhaps you could suggest he slows down in therapy and works at your pace. Also you might use the space to operate in a way differently to what you are used to - challange your therapist by moving out of your comfort zone. But only work as fast or as slow as you can handle otherwise you will feel uncontained.
I really wish you well and hope that you are able to carry on in psychotherapy.