You are entitled to have reactions, but that's not the same as being entitled to verbally abuse your therapist. I don't feel like her response was unprofessional given the provocation. As much as you're talking about empathy, you appear to be unable to employ it yourself. I also don't blame her for telling you about the possibility, because you admit that you asked. Would you have preferred she lie? What could she have done to avoid becoming the object of your attack? You say she should have known how you would react (I disagree, I think your response was outrageous), but the same can be said of you - when you chose to ask, you should have considered whether you could handle the answer.

Until and unless you express sincere remorse for attacking her that way, which it doesn't seem like you will, I think this episode will be a barrier in treatment.

Judgement aside, I'm really sorry you're having to face the possibility of losing your T. That's really tough.