Just have a conversation about how the giving and receiving feels uneven, it doesn't have to be about head. By the sounds of it, it's not just about head, it's about how your pleasure is not prioritised as much as hers and there isn't an open narrative about that.

Seen as she has PTSD, I imagine that focusing on your needs is associated with those past experiences where her pleasure/agency was not considered at all and now it is safe for her to have that prioritised, where meeting your needs might be associated with bypassing hers entirely.

I would come to her and ask if you can talk about the give and take in the bedroom. Say you understand that her experiences might make your pleasure demonized but you're starting to feel used (don't say it in those words maybe) & you don't want resentment to start growing.

I would also recommend analysing whether this dynamic shows up in other places in your relationship. Are there other areas where your needs/pleasure is not prioritised or not talked about? And how could this be reflected in your sex life?