It doesn't have to mean the end of your marriage. Many relationships survive this, but only by addressing it head on and getting into really uncomfortable territory before getting to the other side. You will need to get your hands dirty.
I especially think you guys could be ok if you keep with your approach of being cautious. Cautious with your own reactions and not just losing your block. Breathe and think. You can't think if you're in panic-mode, which it doesn't sound like you're in.
You are doing really, really well, babe xx