This could be a form of anxiety, but it's one I'm not familiar with. Feeling like one is suffocating and having a hard time breathing are definitely symptoms of anxiety, but to the best of my knowledge, it's not because we feel a need to keep talking. I think the vast majority of us during a panic attack become very quiet. I know that talking for me during an attack is nearly impossible. My thinking is usually so scrambled and chaotic, I can't put a complete sentence together and THAT scares me.
Before you get yourself totally freaked out, go see your doctor. It could be a number of things and none of them are fatal or lead to insanity!
With a family history of anxiety, you are more prone to having it and just because it may be manifesting itself in a different way than "normal," doesn't mean anything. We all have jour own personal symptoms.
I think you're fine, but you need to hear that from your doctor.
Let us know what he says, OK?
Peace
Greenlydia