I really think I tore my navel muscle.

If we have a navel muscle.  Or whatever is around there. 

A sneeze took me by surprise on Saturday, and I was leaning back a little bit when it happened.  I felt a hot cutting or tearing sensation going from the bottom of my navel and left about four inches, it was so intense I came close to passing out.  The diverticulitis pain made me catch my breath, this makes me want to cry.  Every time my abdomen flexes it hurts the same all over gain.  I'm doing everything I can to NOT sneeze, not easy in the season of allergies.  This SUCKS.

OUCH....
I am not sure about the anatomy of a belly button, but that sounds wicked painful.

At first, I thought you were...well, you know...(your previous post). :) 
I have no idea what you did, if anything, but if you haven't called the doctor, please do so. It's better to be safe than sorry, as they say.
Take care.
Blessings,
Mary

dear heart...you might have torn some stitches..they hurt like well hell...call your surgeon just in case...
I tore mine by sneezing the last time and got a hernia for it

My postop followup is tomorrow, I'll talk to him about it then.  It's somewhat better today, I've been making sure to take it easy and when I know I'll be flexing that part of my abdomen I press tight with my hand, that seems to help.  I only have the one stitch on my left side, so Im sure it's not that.