Yes I have done exactly that!, well obviously i dont know why you have ptsd or anything but I did and I worked through it with my Sir. I also used to get it so bad that I would pass out and i would also have things that i can only describe as a fit, twitching etc, not in the medical sense.
It was a nightmare in the beggining, I dont want to kid you there, but its tottally possible, I take it that you would never blame your Dom if he did accidentally trigger an attack? If so then keep reminding him of that so that he dosnt blame himself and pull back from you.
You also have to own your emotions, you might not be able to prevent an attack or anything I'm not saying that but try n remind yourself that its not a reaction to whats happening its a random set of chemicals that have been released in your brain.
To start of with I would have to get him to stop a few times a night, even a kiss sometimes would be enough, but then after a while it was once and then not at all. Old sayings help here aswell lol.
If at first you dont succeed try try again and get back on the horse when you fall off lol
Try continueing after you calm down, you might find that after its out of your system then you will be ok. Feel it out slowly what worked for me might not work for you but if you are both willing and patient then there is no reason that you cant work through it together.
Golden rule here: Be honest and forthcoming with him, I mean REALLY honest!
Good luck and pm me if you need a freind, I have been somewhere similar.