Chris,
I want to offer you some encouragement. Being with a partner with PTSD means that you have a lot of patience and love. We are not easy to deal with! So I have to give you some real props for choosing your relationship with her. And I'm sorry that it can be such a struggle.
It sounds like you are having a really hard time trusting her right now. And her actions are speaking louder than her words (well, it's all words and actions jumbled up). I'd like to make a suggestion of maybe taking a break from things like oral sex for a time while you guys sort these things out. Obviously you can't take a break from sleeping, but everyone here has given you some great options to think about for during that time.
The only other thing I will say is that old habits die hard. I still mess up and refer to husband as my ex. And it is not because I'm thinking about him at all. This is not during sex. This is during the day in normal conversation. It's become less and less of an occurrence as time passes. But even so. Perhaps that will offer a bit of comfort for during the normal, waking, non-sexual hours.
Obviously an honest talk is a great thing. Do your best to keep level-headed. Find time when your emotions are calm and use a calm, quiet environment to talk. And do your best to keep your conversation without blame.
Trust and insecurities are two very hard things to work through in any relationship, PTSD or otherwise. And they both take time. So keep being your patient, loving self for your lady and don't give up!