I've learned over the years that my PTSD is a private matter. My friends and family know, of course, but I don't say to people in conversation that I have PTSD. It just opens up a can of worms. It is far more draining to have to explain to strangers what PTSD is, and then you always end up on the defensive side. Defensive side = no good (lol).
When people congratulate me and tell me how strong I am, I will often throw in (in a very lighthearted manner) - well thank you, but trust me I'm the Poster Child for Post Traumatic Stress. No one really seems to comment on this as I am saying it in jest.
I will also say that "even though it was a while ago, it's still pretty traumatizing for me still".
If I am talking with family/friends I would say "my PTSD is kicking in right now".
Sorry for rambling! lol