It's so hard for people to understand what we are going through. It sounds to me like you might need to find a middle ground, where meds take the edge off the triggers etc, but still allow you to feel. It took a while for me to get the right "cocktail." I was either a zombie or a puddle on the floor. Now I'm both.
I find it helpful to print out info and let the person read it. Maybe put an asterik next to things that you're going through that you want him to know. It sounds like you're dealing with some behavioral avoidance which I totally understand.
I tell my hubby...
"It's like walking up to a live wire on the ground and someone telling you to keep picking it up. You KNOW what will happen if you do. Now why would anyone do that just to pick it up, be zapped, then do it all over again."
Also, like our wisestwoman suggested, maybe you could bring hubby with you and let p-doc explain.
You may find the website link helpful.
PTSD info
Keep us posted.
Petunia