Okay, here's what I have to say. I think it's the rare guy that can really understand and deal with a woman freaking out. I'm married, and my husband is pretty great in some ways... but if I'm having a flashback, or flipping out, or completely dissociated, he's no help at all. I've been really committed to my marriage... I took my vows very seriously. But it's been 16 years and I'm tired of never having my emotional needs met. I'm coming to realize how destructive it's been setting all my needs aside under the heading "my husband's not good at emotional things, he can't help it." In the end, needs are just that, NEEDS. If you need your guy to be there for you, then that's what you need and that's perfectly okay.
I wouldn't give up immediately, because I just don't believe in giving up on people. But if you discuss this with him, trying to be very calm and very clear, and he just can't help you, or won't even try... well. Then you know where you're at don't you? You've gotta take care of yourself. And since you suffer from PTSD, you have to take extra good care of yourself, because you deserve it and because you need it.
(And I hope this is all okay to say. I guess it's clear I have some strong feelings on this subject. I'm new here, you can take everything I say with a grain of salt. It could be he is trying... it is very hard to say or do the right thing when trying to help a person with PTSD. Just... that comment "stop putting yourself in a dark place," really got to me. You aren't doing this! You don't have control over it. You don't want these nightmares, these memories! And healing doesn't happen overnight.)