I learned fairly recently that invective... Whether it's Tabernac, f*ck, or phooey ; Doesn't matter the definition of the word, merely that it's a curse word in our own minds... Means that they're stored in different areas of the brain than normal language. So when there is mental anguish? When normal language cannot be reached? Those words are still available.
I don't swear more around PTSD stuff. I snarl more.
Swearing is reserved for when I'm being honest / not running what I'm saying through filters. The more you catch me swearing, the more honest Im being. Conversational tone, most of the time. And used to express a wide variety of emotions... From wonder or approval on down to frustration and fury. Seriously. The whole spectrum.
When I'm really upset, I lose my language almost entirely. Can't speak. Reduced to snarling, glaring, and smiling. Not a nice smile.