Long story short, we've talked about me getting an IUD because it's more effective than the pill, and I can't forget to take it. The main thing giving me pause is that I'm SUPER sensitive to pain, and I don't want to do it because it'll hurt and I'll have cramps and a long period afterwards, and then everyone I've heard says it hurts worse getting taken out.

Sometimes when things are getting frisky he'll mention me getting it so he can finish without a condom ( though he would only do it knowing I was 100% comfortable with it)

Well today things were heating up and he mentioned it and that we should call my doctor right then to make an appointment ( the appointment to sign the paperwork to order it ), and I just started shutting down all of a sudden. He noticed and now he feels like shit for pushing me too far and I feel like shit for making him feel that way, when usually I don't shut down like that.

Logically I know there's not really an issue here but I also don't feel like I can just bounce back because I'm hurt ? Scared ? Idk. 

I'm not sure how to talk to him without also dumping a bunch of intrusive thoughts on him.