I have the same diagnoses for the same reason you do. I am always hypervigilant but not always hyperactive. If there's a connection, I've never noticed it, though now that I think about it, when I am hyperactive, I don't think I am quite as hypervigilant as usual. Does that make sense?

I am supersensitive to others feelings and do not always respond appropriately either. I think that's more symptomatic of ADHD than PTSD.

I'm assuming you've been formally diagnosed by at least one psychiatrist with this, if not, you need to be tested. For what it's worth, I wasn't diagnosed until I was over 40 so you seem to be way ahead in the game compared to me.