Sorry for the false alarm, folks.
Turns out it was a pulled muscle, after all. Well, "Soft Muscle Damage" is what the doctor said, I think. I didn't really hear much past "Your ultrasound was fine. There's no blood clot."
Advil, Aleve, whatever. Let us know if it gets worse.
I'm good with that.
I have come to the conclusion that I may have a little bit of the ol' PTSD where my past health issues are concerned, as can be evidenced by my previous post. I'll admit, I was not in the greatest of places last night.
Feeling much better now, thanks, and extra thanks for the support.