It's awfully hard not to think about a sexual assault, especially if and when you haven't yet had any real time to process it, get support around it and start to heal. Have you and your therapist done any of that work yet -- or have you gotten support from others, if not them -- about this assault?
Why you feel scared and upset is because you were assaulted: that is usually a very scary, very upsetting thing, so it's very common for people to feel scared and upset during and after someone assaults them. It's also scary and upsetting to have an experience that shows us that even when we say no, or even when we push someone away with our bodies, those clear limits and boundaries sometimes that won't be respected. It's scary to find out that can happen, and can make it feel scarier to live in the world after.
I disagree that talking about an assault is something someone who survives one (or more) should stop doing. Most often, silence hurts instead of helps, and breaking that silence, and talking about it with people who are supportive, is how we heal. So, we're certainly glad to talk with you about this as much as you'd like to.
Never doubt that a small group of thoughtful, committed citizens can change the world. Indeed, it is the only thing that ever has. - Margaret Mead